[3.6] bpo-31804: Fix multiprocessing.Process with broken standard streams (GH-6079) #6081
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In some conditions the standard streams will be None or closed in the child process (for example if using "pythonw" instead of "python" on Windows). Avoid failing with a non-0 exit code in those conditions.
Report and initial patch by poxthegreat..
(cherry picked from commit e756f66)
https://bugs.python.org/issue31804