[3.9] bpo-43423: Fix IndexError in subprocess _communicate function (GH-24777) #24823
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Check to make sure stdout and stderr are not empty before selecting an item from them in Windows subprocess._communicate.
Co-authored-by: Gregory P. Smith greg@krypto.org
(cherry picked from commit b4fc44b)
Co-authored-by: Chris Griffith chris@cdgriffith.com
Automerge-Triggered-By: GH:gpshead
https://bugs.python.org/issue43423