'pipenv --venv' results in subprocess.CalledProcessError

Here is a link to the original issue: https://github.com/Microsoft/vscode-python/issues/2968. It should contain all of the information required for this bug report.

In short, VS Code executes `pipenv --venv` behind the scenes when opening a Python project containing a Pipfile. For some reason, this is resulting in an error. I cannot reproduce this issue outside of VS Code...

-------------------------------------------------------------------------------

## Environment data

- VS Code version: 1.28.2 (7f3ce96ff4729c91352ae6def877e59c561f4850)
- Extension version (available under the Extensions sidebar): 2018.9.1
- OS and version: macOS 10.14
- Python version (& distribution if applicable, e.g. Anaconda): 3.7.0
- Type of virtual environment used (N/A | venv | virtualenv | conda | ...): pipenv 

## Actual behavior

Upon opening a project folder with an existing virtual environment, I get the following error message:
```
Workspace contains pipfile but attempt to run 'pipenv --venv' failed with 'Traceback (most recent call last):
  File "/usr/local/bin/pipenv", line 7, in <module>
    from pipenv import cli
  File "/usr/local/lib/python3.7/site-packages/pipenv/__init__.py", line 23, in <module>
    from .cli import cli
  File "/usr/local/lib/python3.7/site-packages/pipenv/cli/__init__.py", line 3, in <module>
    from .command import cli
  File "/usr/local/lib/python3.7/site-packages/pipenv/cli/command.py", line 7, in <module>
    import crayons
  File "/usr/local/lib/python3.7/site-packages/pipenv/patched/crayons.py", line 49, in <module>
    is_powershell = "powershell" in shellingham.detect_shell()[0]
  File "/usr/local/lib/python3.7/site-packages/pipenv/vendor/shellingham/__init__.py", line 22, in detect_shell
    shell = get_shell(pid, max_depth=max_depth)
  File "/usr/local/lib/python3.7/site-packages/pipenv/vendor/shellingham/posix/__init__.py", line 54, in get_shell
    mapping = _get_process_mapping()
  File "/usr/local/lib/python3.7/site-packages/pipenv/vendor/shellingham/posix/__init__.py", line 15, in _get_process_mapping
    mapping = impl.get_process_mapping()
  File "/usr/local/lib/python3.7/site-packages/pipenv/vendor/shellingham/posix/ps.py", line 18, in get_process_mapping
    'ps', '-ww', '-o', 'pid=', '-o', 'ppid=', '-o', 'args=',
  File "/usr/local/Cellar/python/3.7.0/Frameworks/Python.framework/Versions/3.7/lib/python3.7/subprocess.py", line 376, in check_output
    **kwargs).stdout
  File "/usr/local/Cellar/python/3.7.0/Frameworks/Python.framework/Versions/3.7/lib/python3.7/subprocess.py", line 468, in run
    output=stdout, stderr=stderr)
subprocess.CalledProcessError: Command '['ps', '-ww', '-o', 'pid=', '-o', 'ppid=', '-o', 'args=']' returned non-zero exit status 1.'. Make sure pipenv is on the PATH.
```

## Expected  behavior

No error message.

## Steps to reproduce:
1. Create directory.
2. Run `pipenv install` in the directory.
3. Open the directory in VS Code.

-------------------------------------------------------------------------------

Please run `$ pipenv --support`, and paste the results here.

<details><summary>$ pipenv --support</summary>

Pipenv version: `'2018.10.13'`

Pipenv location: `'/Users/kylemart/Library/Python/3.7/lib/python/site-packages/pipenv'`

Python location: `'/usr/local/opt/python/bin/python3.7'`

Python installations found:

  - `3.7.0`: `/usr/local/Cellar/python/3.7.0/Frameworks/Python.framework/Versions/3.7/bin/python3.7`
  - `3.7.0`: `/usr/local/Cellar/python/3.7.0/Frameworks/Python.framework/Versions/3.7/bin/python3.7m`
  - `2.7.15`: `/usr/local/Cellar/python@2/2.7.15_1/Frameworks/Python.framework/Versions/2.7/bin/python2.7`
  - `2.7.10`: `/usr/bin/python`
  - `2.7.10`: `/usr/bin/pythonw`
  - `2.7.10`: `/System/Library/Frameworks/Python.framework/Versions/2.7/bin/python2.7`

PEP 508 Information:

```
{'implementation_name': 'cpython',
 'implementation_version': '3.7.0',
 'os_name': 'posix',
 'platform_machine': 'x86_64',
 'platform_python_implementation': 'CPython',
 'platform_release': '18.0.0',
 'platform_system': 'Darwin',
 'platform_version': 'Darwin Kernel Version 18.0.0: Wed Aug 22 20:13:40 PDT '
                     '2018; root:xnu-4903.201.2~1/RELEASE_X86_64',
 'python_full_version': '3.7.0',
 'python_version': '3.7',
 'sys_platform': 'darwin'}
```

System environment variables:

  - `TERM_SESSION_ID`
  - `SSH_AUTH_SOCK`
  - `Apple_PubSub_Socket_Render`
  - `COLORFGBG`
  - `ITERM_PROFILE`
  - `SQLITE_EXEMPT_PATH_FROM_VNODE_GUARDS`
  - `XPC_FLAGS`
  - `LANG`
  - `PWD`
  - `SHELL`
  - `TERM_PROGRAM_VERSION`
  - `TERM_PROGRAM`
  - `PATH`
  - `COLORTERM`
  - `TERM`
  - `HOME`
  - `TMPDIR`
  - `USER`
  - `XPC_SERVICE_NAME`
  - `LOGNAME`
  - `__CF_USER_TEXT_ENCODING`
  - `ITERM_SESSION_ID`
  - `SHLVL`
  - `OLDPWD`
  - `PROMPT_EOL_MARK`
  - `_`
  - `PYTHONDONTWRITEBYTECODE`
  - `PIP_SHIMS_BASE_MODULE`
  - `PIP_PYTHON_PATH`

Pipenv–specific environment variables:


Debug–specific environment variables:

  - `PATH`: `/Users/kylemart/Library/Python/3.7/bin:/usr/local/sbin:/usr/local/bin:/usr/bin:/bin:/usr/sbin:/sbin:/Applications/VMware Fusion.app/Contents/Public:/Library/TeX/texbin:/usr/local/share/dotnet:/Library/Frameworks/Mono.framework/Versions/Current/Commands:/Applications/Xamarin Workbooks.app/Contents/SharedSupport/path-bin`
  - `SHELL`: `/usr/local/bin/zsh`
  - `LANG`: `en_US.UTF-8`
  - `PWD`: `/Users/kylemart`


---------------------------

</details>




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'pipenv --venv' results in subprocess.CalledProcessError #3109

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