[issue45635] Tidy up error handling in traceback.c / python run.c

[Irit Katriel]

Change by Irit Katriel <iritkatriel at gmail.com>:


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pull_requests: +28207
pull_request: https://github.com/python/cpython/pull/29981

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue45635>
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