Use __contains__
to avoid KeyError
with importlib_metadata==8.0.0
#384
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We don't actually depend on the backport, but a pytest plugin that we are using, pytest-console-scripts, does.
importlib_metadata==8.0.0 now raises a KeyError when we try to get metadata that doesn't exist (where before it would return None).
When running the automated tests, we would fail because the backport would for some reason take precedence over the stdlib. To resolve this, the current impl is replaced with a contains() call.