fix __doc__ is None in optimized mode

[Irvenae]

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Not sure how a specific test can be launched with this env variable (PYTHONOPTIMIZE=2)

[hynek]

Yeah you can't test that. Let's just exclude it from coverage.

Thanks!

[Irvenae]

Thanks for the fast review 🚀 💯

[hynek]

lolsob looks like a) i've screwed up the indent in the changelog and b) mypy doesn't know about -OO. I'll just merge and fiddle until it works – thanks!

[hynek]

JFTR, I've actually managed to build a test case: 1d66f67 😅

[hynek]

FYI 21.4 is on PyPI