`pipenv clean` fails when `pip freeze` produces output with comments

- [x] Be sure to check the existing issues (both open and closed!).
  * same stack trace but unrelated: #1750 
  * PR to fix a similar issue with `pipenv update`: #1268 

`do_clean` assumes that the output of `pip freeze` produces only requirement lines, but it can in some cases produce `#`-prefixed comments (see https://github.com/pypa/pip/blob/729990c9869148f3f0098a2b2a0c0b92aefb8a69/src/pip/_internal/operations/freeze.py#L188 for one such example). It looks as though this was noticed and fixed for `pipenv update` in 9.1.0 (see f322d93)

<details><summary>$ python -m pipenv.help output</summary>

Pipenv version: `'2018.05.18'`

Pipenv location: `'$HOME/.virtualenvs/pipenv-issue/local/lib/python2.7/site-packages/pipenv'`

Python location: `'$HOME/.virtualenvs/pipenv-issue/bin/python'`

Other Python installations in `PATH`:

  - `2.7`: `$HOME/.virtualenvs/pipenv-issue/bin/python2.7`
  - `2.7`: `$HOME/.virtualenvs/pipenv-issue/bin/python2.7`
  - `2.7`: `/usr/bin/python2.7`
  - `3.5`: `/usr/bin/python3.5m`
  - `3.5`: `/usr/bin/python3.5`

  - `2.7.12`: `$HOME/.virtualenvs/pipenv-issue/bin/python`
  - `2.7.12`: `/usr/bin/python`
  - `2.7.12`: `$HOME/.virtualenvs/pipenv-issue/bin/python2`
  - `2.7.12`: `/usr/bin/python2`
  - `3.5.2`: `/usr/bin/python3`

PEP 508 Information:

```
{'implementation_name': 'cpython',
 'implementation_version': '0',
 'os_name': 'posix',
 'platform_machine': 'x86_64',
 'platform_python_implementation': 'CPython',
 'platform_release': '4.4.0-124-generic',
 'platform_system': 'Linux',
 'platform_version': '#148-Ubuntu SMP Wed May 2 13:00:18 UTC 2018',
 'python_full_version': '2.7.12',
 'python_version': '2.7',
 'sys_platform': 'linux2'}
```

System environment variables:

  - `MANDATORY_PATH`
  - `XDG_GREETER_DATA_DIR`
  - `GNOME_DESKTOP_SESSION_ID`
  - `UPSTART_EVENTS`
  - `PYTHONDONTWRITEBYTECODE`
  - `LESSOPEN`
  - `XDG_SESSION_TYPE`
  - `QT_IM_MODULE`
  - `LOGNAME`
  - `USER`
  - `PATH`
  - `XDG_VTNR`
  - `GNOME_KEYRING_CONTROL`
  - `PS1`
  - `DISPLAY`
  - `LANG`
  - `TERM`
  - `SHELL`
  - `XDG_SESSION_PATH`
  - `XAUTHORITY`
  - `LANGUAGE`
  - `COMPIZ_CONFIG_PROFILE`
  - `SHLVL`
  - `QT_LINUX_ACCESSIBILITY_ALWAYS_ON`
  - `QT_QPA_PLATFORMTHEME`
  - `QT_ACCESSIBILITY`
  - `UPSTART_INSTANCE`
  - `CLUTTER_IM_MODULE`
  - `WINDOWID`
  - `SESSIONTYPE`
  - `XMODIFIERS`
  - `GPG_AGENT_INFO`
  - `HOME`
  - `QT4_IM_MODULE`
  - `GTK2_MODULES`
  - `XDG_SESSION_DESKTOP`
  - `SSH_AUTH_SOCK`
  - `XDG_RUNTIME_DIR`
  - `INSTANCE`
  - `COMP_WORDBREAKS`
  - `VTE_VERSION`
  - `GDMSESSION`
  - `IM_CONFIG_PHASE`
  - `UPSTART_JOB`
  - `UPSTART_SESSION`
  - `GNOME_KEYRING_PID`
  - `XDG_SEAT_PATH`
  - `LESSCLOSE`
  - `PIP_PYTHON_PATH`
  - `XDG_CURRENT_DESKTOP`
  - `XDG_SESSION_ID`
  - `DBUS_SESSION_BUS_ADDRESS`
  - `_`
  - `DEFAULTS_PATH`
  - `GTK_IM_MODULE`
  - `DESKTOP_SESSION`
  - `VIRTUAL_ENV`
  - `XDG_CONFIG_DIRS`
  - `GTK_MODULES`
  - `GDM_LANG`
  - `XDG_DATA_DIRS`
  - `PWD`
  - `JOB`
  - `LS_COLORS`
  - `XDG_SEAT`

Pipenv–specific environment variables:


Debug–specific environment variables:

  - `PATH`: `$HOME/.virtualenvs/pipenv-issue/bin:$HOME/.local/bin:$HOME/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games:/snap/bin:$HOME/.rvm/bin:$HOME/.rvm/bin`
  - `SHELL`: `/usr/bin/fish`
  - `LANG`: `en_AU.UTF-8`
  - `PWD`: `$HOME`
  - `VIRTUAL_ENV`: `$HOME/.virtualenvs/pipenv-issue`


---------------------------

</details>

------------

##### Expected result

```
$ pipenv clean
Uninstalling 'empty'…
```

##### Actual result
```

$ pipenv clean
Locking [dev-packages] dependencies…
Locking [packages] dependencies…
Updated Pipfile.lock (dfae9f)!
Traceback (most recent call last):
  File "$HOME/.virtualenvs/pipenv-issue/bin/pipenv", line 11, in <module>
    sys.exit(cli())
  File "$HOME/.virtualenvs/pipenv-issue/lib/python2.7/site-packages/pipenv/vendor/click/core.py", line 722, in __call__
    return self.main(*args, **kwargs)
  File "$HOME/.virtualenvs/pipenv-issue/lib/python2.7/site-packages/pipenv/vendor/click/core.py", line 697, in main
    rv = self.invoke(ctx)
  File "$HOME/.virtualenvs/pipenv-issue/lib/python2.7/site-packages/pipenv/vendor/click/core.py", line 1066, in invoke
    return _process_result(sub_ctx.command.invoke(sub_ctx))
  File "$HOME/.virtualenvs/pipenv-issue/lib/python2.7/site-packages/pipenv/vendor/click/core.py", line 895, in invoke
    return ctx.invoke(self.callback, **ctx.params)
  File "$HOME/.virtualenvs/pipenv-issue/lib/python2.7/site-packages/pipenv/vendor/click/core.py", line 535, in invoke
    return callback(*args, **kwargs)
  File "$HOME/.virtualenvs/pipenv-issue/lib/python2.7/site-packages/pipenv/vendor/click/decorators.py", line 17, in new_func
    return f(get_current_context(), *args, **kwargs)
  File "$HOME/.virtualenvs/pipenv-issue/local/lib/python2.7/site-packages/pipenv/cli.py", line 1009, in clean
    ctx=ctx, three=three, python=python, dry_run=dry_run, verbose=verbose
  File "$HOME/.virtualenvs/pipenv-issue/local/lib/python2.7/site-packages/pipenv/core.py", line 2539, in do_clean
    r = get_requirement(installed)
  File "$HOME/.virtualenvs/pipenv-issue/local/lib/python2.7/site-packages/pipenv/utils.py", line 142, in get_requirement
    req = [r for r in requirements.parse(dep)][0]
IndexError: list index out of range
```

##### Steps to replicate

```
$ cd $(mktemp -d)
$ cat <<EOF >setup.py
> from setuptools import setup
> setup(name='empty')
> EOF
$ mkdir .git
$ pipenv run pip install -e .
$ pipenv clean
```

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`pipenv clean` fails when `pip freeze` produces output with comments #2229

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pipenv clean fails when pip freeze produces output with comments #2229

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