[issue19946] Handle a non-importable __main__ in multiprocessing

[Nick Coghlan]

Nick Coghlan added the comment:

With the restructuring in my patch, it would be easy enough to move the "early return" cases from the _fixup_main_* functions to instead be "don't set the variable" cases in get_preparation_data.

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<http://bugs.python.org/issue19946>
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