[issue30384] traceback.TracebackException.format shouldn't format_exc_only() when __traceback__ is None

[Irit Katriel]

Irit Katriel <iritkatriel at yahoo.com> added the comment:

__traceback__  doesn't disable printing tracebacks.  It *is* the traceback. By setting it to None you erased the exception's traceback.

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue30384>
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