[issue46345] Add an explicit test for `get_type_hints` for a class field with `None` default

[miss-islington]

miss-islington <mariatta.wijaya+miss-islington at gmail.com> added the comment:


New changeset d9101c4e49dc29f21319493818130ad5468402a2 by Miss Islington (bot) in branch '3.9':
bpo-46345: Add a test case for implicit `Optional` class attribute (GH-30535)
https://github.com/python/cpython/commit/d9101c4e49dc29f21319493818130ad5468402a2


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<https://bugs.python.org/issue46345>
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