[issue24695] Don't print traceback header if traceback is None in TracebackException

[Irit Katriel]

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

The patch here added a reference from TracebackException to the actual traceback, which I think should be removed. Please see this issue: https://bugs.python.org/issue42482

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nosy: +iritkatriel

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue24695>
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