[issue28910] Async generator does not raise RuntimeError if finalizer not set

[Yury Selivanov]

Yury Selivanov added the comment:

fix: https://github.com/python/peps/commit/3e23210fe3aebefb269436e16246f63e1f006291

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue28910>
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