[issue35454] Fix miscellaneous issues in error handling

[Serhiy Storchaka]

New submission from Serhiy Storchaka <storchaka+cpython at gmail.com>:

The proposed patch fixes miscellaneous issues in error handling.

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components: Extension Modules, Interpreter Core
messages: 331504
nosy: serhiy.storchaka, vstinner
priority: normal
severity: normal
status: open
title: Fix miscellaneous issues in error handling
type: behavior
versions: Python 3.6, Python 3.7, Python 3.8

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue35454>
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