Ensure that bare attributes with default None are removed too #556
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| @@ -504,7 +507,7 @@ def _patch_original_class(self): | |||
| for name in self._attr_names: | |||
| if ( | |||
| name not in base_names | |||
| and getattr(cls, name, None) is not None | |||
| and getattr(cls, name, _sentinel) != _sentinel | |||
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Fixes #523
Classic None-as-sentinel-where-None-is-a-valid-value-blunder.