[issue33623] Fix possible SIGSGV when asyncio.Future is created in __del__

[Serhiy Storchaka]

Serhiy Storchaka <storchaka+cpython at gmail.com> added the comment:

Then we should find what callable is NULL and fix the place where it is called. _PyObject_FastCallDict() should never be called with NULL.

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue33623>
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