[issue35459] Use PyDict_GetItemWithError() instead of PyDict_GetItem()

[Serhiy Storchaka]

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


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nosy: +eric.snow, rhettinger

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue35459>
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