[issue17117] Update importlib.util.module_for_loader/set_loader to set when __loader__ = None

[Gökcen Eraslan]

Gökcen Eraslan added the comment:

I have already given my form to akheron during a Python sprint, I think he will submit it to PSF within a few days.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue17117>
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