[issue31572] Avoid suppressing all exceptions in PyObject_HasAttr()

[Serhiy Storchaka]

Changes by Serhiy Storchaka <storchaka+cpython at gmail.com>:


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keywords: +patch
pull_requests: +3709
stage:  -> patch review

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue31572>
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