[issue27692] Clean serveral unnecessary NULL checks in exceptions.c

[Roundup Robot]

Roundup Robot added the comment:

New changeset 6e6aa2054824 by Serhiy Storchaka in branch 'default':
Issue #27692: Removed unnecessary NULL checks in exceptions.c.
https://hg.python.org/cpython/rev/6e6aa2054824

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nosy: +python-dev

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue27692>
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