pipenv run --help crashes

[boustrophedon]

Issue description

Pipenv 2018.7.1

In any directory (either containing an existing Pipfile or not), running pipenv run --help crashes.

Expected result

The help text for the run command.

Actual result

https://gist.github.com/boustrophedon/c396bf9e6c287f818f9b2ddf23ecebc7

Steps to replicate

Provide the steps to replicate (which usually at least includes the commands and the Pipfile).

run the command pipenv run --help

---

pipenv --support:
https://gist.github.com/boustrophedon/b68b539241d0ac5fd4aa0974eaf39c89

[frostming]

Closed via #3844

[boustrophedon]

Thank you!