pipenv install error: "AttributeError: 'NoneType' object has no attribute 'url'"

### Issue description
I tried using the command `pipenv install` with a Pipfile and Pipfile.lock in my current directory. While during the "Build Requirements" stage of the process, this error was thrown: `AttributeError: 'NoneType' object has no attribute 'url'`

### Expected result

pipenv should have created a new environment from my pipfile, with python3.8.

### Actual result

Build failed.

-------------------------------------------------------------------------------

pipenv --support details:

ipenv version: `'2020.11.15'`

Pipenv location: `'/home/joe/.local/lib/python3.9/site-packages/pipenv'`

Python location: `'/usr/bin/python3.9'`

Python installations found:

  - `3.9.0`: `/usr/bin/python3.9`
  - `3.9.0`: `/bin/python3.9`
  - `3.8.6`: `/usr/bin/python3.8`
  - `3.8.6`: `/usr/bin/python3`
  - `3.8.6`: `/bin/python3.8`
  - `3.8.6`: `/bin/python3`

PEP 508 Information:

```
{'implementation_name': 'cpython',
 'implementation_version': '3.9.0',
 'os_name': 'posix',
 'platform_machine': 'x86_64',
 'platform_python_implementation': 'CPython',
 'platform_release': '5.8.0-7625-generic',
 'platform_system': 'Linux',
 'platform_version': '#26~1604441477~20.10~d41e407-Ubuntu SMP Wed Nov 4 '
                     '01:25:00 UTC 2',
 'python_full_version': '3.9.0+',
 'python_version': '3.9',
 'sys_platform': 'linux'}
```

System environment variables:

  - `ALACRITTY_LOG`
  - `BROWSER`
  - `COLORTERM`
  - `DBUS_SESSION_BUS_ADDRESS`
  - `DESKTOP_SESSION`
  - `DISPLAY`
  - `DOTFILES`
  - `EDITOR`
  - `GDMSESSION`
  - `GIO_LAUNCHED_DESKTOP_FILE_PID`
  - `GNOME_DESKTOP_SESSION_ID`
  - `GNOME_SHELL_SESSION_MODE`
  - `GPG_AGENT_INFO`
  - `GTK_IM_MODULE`
  - `GTK_MODULES`
  - `HOME`
  - `INVOCATION_ID`
  - `JOURNAL_STREAM`
  - `LANG`
  - `LANGUAGE`
  - `LC_ADDRESS`
  - `LC_IDENTIFICATION`
  - `LC_MEASUREMENT`
  - `LC_MONETARY`
  - `LC_NAME`
  - `LC_NUMERIC`
  - `LC_PAPER`
  - `LC_TELEPHONE`
  - `LC_TIME`
  - `LIBVIRT_DEFAULT_URI`
  - `LOGNAME`
  - `LS_COLORS`
  - `MANAGERPID`
  - `PAPERSIZE`
  - `PATH`
  - `PWD`
  - `QT_ACCESSIBILITY`
  - `QT_IM_MODULE`
  - `SESSION_MANAGER`
  - `SHELL`
  - `SHLVL`
  - `SSH_AGENT_LAUNCHER`
  - `SSH_AUTH_SOCK`
  - `STARSHIP_SHELL`
  - `TERM`
  - `USER`
  - `USERNAME`
  - `WINDOWID`
  - `WINDOWPATH`
  - `XAUTHORITY`
  - `XDG_CACHE_HOME`
  - `XDG_CONFIG_DIRS`
  - `XDG_CONFIG_HOME`
  - `XDG_CURRENT_DESKTOP`
  - `XDG_DATA_DIRS`
  - `XDG_DATA_HOME`
  - `XDG_MENU_PREFIX`
  - `XDG_RUNTIME_DIR`
  - `XDG_SESSION_CLASS`
  - `XDG_SESSION_DESKTOP`
  - `XDG_SESSION_TYPE`
  - `XMODIFIERS`
  - `PIP_DISABLE_PIP_VERSION_CHECK`
  - `PYTHONDONTWRITEBYTECODE`
  - `PIP_SHIMS_BASE_MODULE`
  - `PIP_PYTHON_PATH`
  - `PYTHONFINDER_IGNORE_UNSUPPORTED`

Pipenv–specific environment variables:


Debug–specific environment variables:

  - `PATH`: `/home/joe/.cargo/bin:/home/joe/.local/bin:/home/joe/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games:/snap/bin:/home/joe/.dotnet/tools:/usr/local/go/bin`
  - `SHELL`: `/usr/bin/fish`
  - `EDITOR`: `nvim`
  - `LANG`: `en_US.UTF-8`
  - `PWD`: `/home/joe/Source/python/Oauth-Checker`


---------------------------

Contents of `Pipfile` ('/home/joe/Source/python/Oauth-Checker/Pipfile'):

```toml
[[source]]
name = "pypi"
url = "https://pypi.org/simple"
verify_ssl = true

[dev-packages]
pylint = "*"
v = {editable = true,version = "*"}
autopep8 = "*"
pydocstyle = "*"
pycodestyle = "*"

[packages]
requests = "*"

[requires]
python_version = "3.8"

```


Contents of `Pipfile.lock` ('/home/joe/Source/python/Oauth-Checker/Pipfile.lock'):

```json
{
    "_meta": {
        "hash": {
            "sha256": "455ae6709a742e504bcc55200d21f5780e607956a66533765a0e4fe141f1899e"
        },
        "pipfile-spec": 6,
        "requires": {
            "python_version": "3.7"
        },
        "sources": [
            {
                "name": "pypi",
                "url": "https://pypi.org/simple",
                "verify_ssl": true
            }
        ]
    },
    "default": {
        "certifi": {
            "hashes": [
                "sha256:017c25db2a153ce562900032d5bc68e9f191e44e9a0f762f373977de9df1fbb3",
                "sha256:25b64c7da4cd7479594d035c08c2d809eb4aab3a26e5a990ea98cc450c320f1f"
            ],
            "version": "==2019.11.28"
        },
        "chardet": {
            "hashes": [
                "sha256:84ab92ed1c4d4f16916e05906b6b75a6c0fb5db821cc65e70cbd64a3e2a5eaae",
                "sha256:fc323ffcaeaed0e0a02bf4d117757b98aed530d9ed4531e3e15460124c106691"
            ],
            "version": "==3.0.4"
        },
        "idna": {
            "hashes": [
                "sha256:7588d1c14ae4c77d74036e8c22ff447b26d0fde8f007354fd48a7814db15b7cb",
                "sha256:a068a21ceac8a4d63dbfd964670474107f541babbd2250d61922f029858365fa"
            ],
            "version": "==2.9"
        },
        "requests": {
            "hashes": [
                "sha256:43999036bfa82904b6af1d99e4882b560e5e2c68e5c4b0aa03b655f3d7d73fee",
                "sha256:b3f43d496c6daba4493e7c431722aeb7dbc6288f52a6e04e7b6023b0247817e6"
            ],
            "index": "pypi",
            "version": "==2.23.0"
        },
        "urllib3": {
            "hashes": [
                "sha256:2f3db8b19923a873b3e5256dc9c2dedfa883e33d87c690d9c7913e1f40673cdc",
                "sha256:87716c2d2a7121198ebcb7ce7cccf6ce5e9ba539041cfbaeecfb641dc0bf6acc"
            ],
            "version": "==1.25.8"
        }
    },
    "develop": {
        "astroid": {
            "hashes": [
                "sha256:71ea07f44df9568a75d0f354c49143a4575d90645e9fead6dfb52c26a85ed13a",
                "sha256:840947ebfa8b58f318d42301cf8c0a20fd794a33b61cc4638e28e9e61ba32f42"
            ],
            "version": "==2.3.3"
        },
        "autopep8": {
            "hashes": [
                "sha256:0f592a0447acea0c2b0a9602be1e4e3d86db52badd2e3c84f0193bfd89fd3a43"
            ],
            "index": "pypi",
            "version": "==1.5"
        },
        "isort": {
            "hashes": [
                "sha256:54da7e92468955c4fceacd0c86bd0ec997b0e1ee80d97f67c35a78b719dccab1",
                "sha256:6e811fcb295968434526407adb8796944f1988c5b65e8139058f2014cbe100fd"
            ],
            "version": "==4.3.21"
        },
        "lazy-object-proxy": {
            "hashes": [
                "sha256:0c4b206227a8097f05c4dbdd323c50edf81f15db3b8dc064d08c62d37e1a504d",
                "sha256:194d092e6f246b906e8f70884e620e459fc54db3259e60cf69a4d66c3fda3449",
                "sha256:1be7e4c9f96948003609aa6c974ae59830a6baecc5376c25c92d7d697e684c08",
                "sha256:4677f594e474c91da97f489fea5b7daa17b5517190899cf213697e48d3902f5a",
                "sha256:48dab84ebd4831077b150572aec802f303117c8cc5c871e182447281ebf3ac50",
                "sha256:5541cada25cd173702dbd99f8e22434105456314462326f06dba3e180f203dfd",
                "sha256:59f79fef100b09564bc2df42ea2d8d21a64fdcda64979c0fa3db7bdaabaf6239",
                "sha256:8d859b89baf8ef7f8bc6b00aa20316483d67f0b1cbf422f5b4dc56701c8f2ffb",
                "sha256:9254f4358b9b541e3441b007a0ea0764b9d056afdeafc1a5569eee1cc6c1b9ea",
                "sha256:9651375199045a358eb6741df3e02a651e0330be090b3bc79f6d0de31a80ec3e",
                "sha256:97bb5884f6f1cdce0099f86b907aa41c970c3c672ac8b9c8352789e103cf3156",
                "sha256:9b15f3f4c0f35727d3a0fba4b770b3c4ebbb1fa907dbcc046a1d2799f3edd142",
                "sha256:a2238e9d1bb71a56cd710611a1614d1194dc10a175c1e08d75e1a7bcc250d442",
                "sha256:a6ae12d08c0bf9909ce12385803a543bfe99b95fe01e752536a60af2b7797c62",
                "sha256:ca0a928a3ddbc5725be2dd1cf895ec0a254798915fb3a36af0964a0a4149e3db",
                "sha256:cb2c7c57005a6804ab66f106ceb8482da55f5314b7fcb06551db1edae4ad1531",
                "sha256:d74bb8693bf9cf75ac3b47a54d716bbb1a92648d5f781fc799347cfc95952383",
                "sha256:d945239a5639b3ff35b70a88c5f2f491913eb94871780ebfabb2568bd58afc5a",
                "sha256:eba7011090323c1dadf18b3b689845fd96a61ba0a1dfbd7f24b921398affc357",
                "sha256:efa1909120ce98bbb3777e8b6f92237f5d5c8ea6758efea36a473e1d38f7d3e4",
                "sha256:f3900e8a5de27447acbf900b4750b0ddfd7ec1ea7fbaf11dfa911141bc522af0"
            ],
            "version": "==1.4.3"
        },
        "mccabe": {
            "hashes": [
                "sha256:ab8a6258860da4b6677da4bd2fe5dc2c659cff31b3ee4f7f5d64e79735b80d42",
                "sha256:dd8d182285a0fe56bace7f45b5e7d1a6ebcbf524e8f3bd87eb0f125271b8831f"
            ],
            "version": "==0.6.1"
        },
        "pycodestyle": {
            "hashes": [
                "sha256:95a2219d12372f05704562a14ec30bc76b05a5b297b21a5dfe3f6fac3491ae56",
                "sha256:e40a936c9a450ad81df37f549d676d127b1b66000a6c500caa2b085bc0ca976c"
            ],
            "index": "pypi",
            "version": "==2.5.0"
        },
        "pydocstyle": {
            "hashes": [
                "sha256:da7831660b7355307b32778c4a0dbfb137d89254ef31a2b2978f50fc0b4d7586",
                "sha256:f4f5d210610c2d153fae39093d44224c17429e2ad7da12a8b419aba5c2f614b5"
            ],
            "index": "pypi",
            "version": "==5.0.2"
        },
        "pylint": {
            "hashes": [
                "sha256:3db5468ad013380e987410a8d6956226963aed94ecb5f9d3a28acca6d9ac36cd",
                "sha256:886e6afc935ea2590b462664b161ca9a5e40168ea99e5300935f6591ad467df4"
            ],
            "index": "pypi",
            "version": "==2.4.4"
        },
        "six": {
            "hashes": [
                "sha256:236bdbdce46e6e6a3d61a337c0f8b763ca1e8717c03b369e87a7ec7ce1319c0a",
                "sha256:8f3cd2e254d8f793e7f3d6d9df77b92252b52637291d0f0da013c76ea2724b6c"
            ],
            "version": "==1.14.0"
        },
        "snowballstemmer": {
            "hashes": [
                "sha256:209f257d7533fdb3cb73bdbd24f436239ca3b2fa67d56f6ff88e86be08cc5ef0",
                "sha256:df3bac3df4c2c01363f3dd2cfa78cce2840a79b9f1c2d2de9ce8d31683992f52"
            ],
            "version": "==2.0.0"
        },
        "typed-ast": {
            "hashes": [
                "sha256:0666aa36131496aed8f7be0410ff974562ab7eeac11ef351def9ea6fa28f6355",
                "sha256:0c2c07682d61a629b68433afb159376e24e5b2fd4641d35424e462169c0a7919",
                "sha256:249862707802d40f7f29f6e1aad8d84b5aa9e44552d2cc17384b209f091276aa",
                "sha256:24995c843eb0ad11a4527b026b4dde3da70e1f2d8806c99b7b4a7cf491612652",
                "sha256:269151951236b0f9a6f04015a9004084a5ab0d5f19b57de779f908621e7d8b75",
                "sha256:4083861b0aa07990b619bd7ddc365eb7fa4b817e99cf5f8d9cf21a42780f6e01",
                "sha256:498b0f36cc7054c1fead3d7fc59d2150f4d5c6c56ba7fb150c013fbc683a8d2d",
                "sha256:4e3e5da80ccbebfff202a67bf900d081906c358ccc3d5e3c8aea42fdfdfd51c1",
                "sha256:6daac9731f172c2a22ade6ed0c00197ee7cc1221aa84cfdf9c31defeb059a907",
                "sha256:715ff2f2df46121071622063fc7543d9b1fd19ebfc4f5c8895af64a77a8c852c",
                "sha256:73d785a950fc82dd2a25897d525d003f6378d1cb23ab305578394694202a58c3",
                "sha256:8c8aaad94455178e3187ab22c8b01a3837f8ee50e09cf31f1ba129eb293ec30b",
                "sha256:8ce678dbaf790dbdb3eba24056d5364fb45944f33553dd5869b7580cdbb83614",
                "sha256:aaee9905aee35ba5905cfb3c62f3e83b3bec7b39413f0a7f19be4e547ea01ebb",
                "sha256:bcd3b13b56ea479b3650b82cabd6b5343a625b0ced5429e4ccad28a8973f301b",
                "sha256:c9e348e02e4d2b4a8b2eedb48210430658df6951fa484e59de33ff773fbd4b41",
                "sha256:d205b1b46085271b4e15f670058ce182bd1199e56b317bf2ec004b6a44f911f6",
                "sha256:d43943ef777f9a1c42bf4e552ba23ac77a6351de620aa9acf64ad54933ad4d34",
                "sha256:d5d33e9e7af3b34a40dc05f498939f0ebf187f07c385fd58d591c533ad8562fe",
                "sha256:fc0fea399acb12edbf8a628ba8d2312f583bdbdb3335635db062fa98cf71fca4",
                "sha256:fe460b922ec15dd205595c9b5b99e2f056fd98ae8f9f56b888e7a17dc2b757e7"
            ],
            "markers": "implementation_name == 'cpython' and python_version < '3.8'",
            "version": "==1.4.1"
        },
        "v": {
            "hashes": [
                "sha256:2d5a8f79a36aaebe62ef2c7068e3ec7f86656078202edabfdbf74715dc822d36",
                "sha256:cd6b6b20b4a611f209c88bcdfb7211321f85662efb2bdd53a7b40314d0a84618"
            ],
            "index": "pypi",
            "version": "==0.0.0"
        },
        "wrapt": {
            "hashes": [
                "sha256:565a021fd19419476b9362b05eeaa094178de64f8361e44468f9e9d7843901e1"
            ],
            "version": "==1.11.2"
        }
    }
}

```

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pipenv install error: "AttributeError: 'NoneType' object has no attribute 'url'" #4582

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