[issue44264] Add descriptive error message when environment variable not detected

[Irit Katriel]

Irit Katriel <iritkatriel at gmail.com> added the comment:

> if a user of a Python program were to come across it, it may not indicate what they needed to do to avoid the crash. 

The user of a program should not see this exception. The program should translate it to an error that would make sense to the user.

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resolution:  -> rejected
status: open -> pending

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue44264>
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