[docs] [issue32374] Document that m_traverse for multi-phase initialized modules can be called with m_state=NULL

[Petr Viktorin]

Petr Viktorin <encukou at gmail.com> added the comment:

> That's a weak test: if the script fails before calling spec.loader.create_module(), the test also pass. If the function raises an exception but don't crash, the test pass as well.

That's a good argument, thanks.
Marcel, would you mind adding a patch for that?

> More generally, I'm not sure about the idea of making sure that doing bad stuff with traverse does crash. What is the purpose of the test?

This particular kind of bad traverse is quite easy to write if an extension author doesn't read docs carefully, or has read an old version of them (before the fix here). And resulting errors aren't too obvious. So, there's code to crash early and loudly in "--with-pydebug" for simple oversight cases. See comment at the call site of bad_traverse_test in Objects/moduleobject.c
And since there's code, there's a test to make sure it works :)

> In the meanwhile, I fixed bpo-33629 by adding test.support.SuppressCrashReport().

Thanks! Didn't know about that one, will keep it in mind for next time!

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<https://bugs.python.org/issue32374>
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