[issue37493] Use _PyObject_CallNoArg() in a few more places

[Jeroen Demeyer]

Change by Jeroen Demeyer <J.Demeyer at UGent.be>:


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resolution:  -> fixed
stage: patch review -> resolved
status: open -> closed

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue37493>
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