Show better error if virtual env is broken

[sinscary]

This shows the better error to the user if virtual env is broken
also suggests commands that can solve the issue

Closes #1918

[uranusjr]

Hi, thanks for the work! I feel the pipenv install part could be made more general—people don’t necessarily use it to bootstrap their environments, and generally want to specify a Python version/executable themselves. Something like “Running pipenv --rm and rebuild the virtual environment may resolve the issue” could be better, but I wonder if that is a clear enough instruction for more relatively inexperienced users. What do you think?

[sinscary]

@uranusjr You are right. I think we can show this error message something like this,
"Running pipenv --rm and rebuild the virtual environment with pipenv install <python_version> may resolve the issue", What say?

[uranusjr]

Maybe something like “… rebuild the virtual environment, e.g. pipenv install”?

[sinscary]

Yeah, that's also good. But I think that if it comes to specifying the python version, it still might be confusing for them. Then I think we shouldn't even specify the pipenv install command. I think what you suggested first would be much better.

[uranusjr]

I’m very bad at figuring out what is more understandable for newcomers, so I’ll leave the decision to you :) I’ll merge either way.

[sinscary]

Well, I think the first one you suggested was good so I am going with it.

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[Raffffqq]

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