[issue37868] `is_dataclass` returns `True` if `getattr` always succeeds.

[miss-islington]

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


New changeset 02c1457a036c2af3e91beb952afdb66d9c806435 by Miss Islington (bot) in branch '3.7':
bpo-37868: Improve is_dataclass for instances. (GH-15325)
https://github.com/python/cpython/commit/02c1457a036c2af3e91beb952afdb66d9c806435


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<https://bugs.python.org/issue37868>
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