[issue18426] Crash when extension does not use PyModule_Create()

[Amaury Forgeot d'Arc]

Amaury Forgeot d'Arc added the comment:

I'm not sure the fix is correct: PyModule_GetDef() can return NULL without setting an error, for example when the init function returns a regular Python module.

I'm OK to require the init function to return a module created with PyModule_Create(), and fail when it's not the case. But an exception should be set.
(and a unit test would help...)

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nosy: +amaury.forgeotdarc

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<http://bugs.python.org/issue18426>
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