[issue21052] Consider dropping ImportWarning for empty sys.path_hooks and sys.meta_path

[Roundup Robot]

Roundup Robot added the comment:

New changeset d9f71bc6d897 by Brett Cannon in branch 'default':
Issue #21052: Don't raise ImportWarning for sys.meta_path or
https://hg.python.org/cpython/rev/d9f71bc6d897

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nosy: +python-dev

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