[PR #13029/8cff1286 backport][8.3.x] fix AttributeError crash when using --import-mode=importlib

[patchback]

This is a backport of PR #13029 as merged into main (8cff128).

closes #13026 .

• Include new tests or update existing tests when applicable.
• Allow maintainers to push and squash when merging my commits.
• Create a new changelog file in the changelog folder.

Only parent modules with the __path__ attribute can be used by the find_spec function, and most of the standard library does not meet this condition.

https://github.com/python/cpython/blob/3.9/Lib/importlib/_bootstrap_external.py#L1223

   def _find_parent_path_names(self):
        """Returns a tuple of (parent-module-name, parent-path-attr-name)"""
        parent, dot, me = self._name.rpartition('.')
        if dot == '':
            # This is a top-level module. sys.path contains the parent path.
            return 'sys', 'path'
        # Not a top-level module. parent-module.__path__ contains the
        #  parent path.
        return parent, '__path__'

So this PR adds a condition check.