Friendlier error resolver failure -- no stacktrace (shows pip error more directly)

[matteius]

Thank you for contributing to Pipenv!

The issue

Fixes #6090 -- maybe? @Kroppeb can you confirm?

The checklist

• [X] Associated issue
• [ ] A news fragment in the news/ directory to describe this fix with the extension .bugfix.rst, .feature.rst, .behavior.rst, .doc.rst. .vendor.rst. or .trivial.rst (this will appear in the release changelog). Use semantic line breaks and name the file after the issue number or the PR #.

[Kroppeb]

Seems like that would help. Not sure if I'll be able to test it (in the near future).