[issue28721] Fix asynchronous generators athrow() and aclose() to handle StopAsyncIteration

[Roundup Robot]

Roundup Robot added the comment:

New changeset 0f12a1d3a737 by Yury Selivanov in branch '3.6':
Issue #28721: Fix asynchronous generators aclose() and athrow()
https://hg.python.org/cpython/rev/0f12a1d3a737

New changeset 22cd78026ad1 by Yury Selivanov in branch 'default':
Merge 3.6 (issue #28721)
https://hg.python.org/cpython/rev/22cd78026ad1

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nosy: +python-dev

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