15:10:46     def _addSkip(self: TestCaseFunction, testcase: TestCase, reason: str) -> None:
15:10:46         from unittest.case import _SubTest  # type: ignore[attr-defined]
15:10:46     
15:10:46         if isinstance(testcase, _SubTest):
15:10:46             self._originaladdSkip(testcase, reason)  # type: ignore[attr-defined]
15:10:46             if self._excinfo is not None:
15:10:46                 exc_info = self._excinfo[-1]
15:10:46                 self.addSubTest(testcase.test_case, testcase, exc_info)  # type: ignore[attr-defined]
15:10:46         else:
15:10:46             # For python < 3.11: the non-subtest skips have to be added by `_originaladdSkip` only after all subtest
15:10:46             # failures are processed by `_addSubTest`.
15:10:46             if sys.version_info < (3, 11):
15:10:46                 subtest_errors = [
15:10:46                     x
15:10:46 >                   for x, y in self.instance._outcome.errors
15:10:46                     if isinstance(x, _SubTest) and y is not None
15:10:46                 ]
15:10:46 E               AttributeError: 'NoneType' object has no attribute 'errors'