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bpo-26510: make argparse subparsers required by default (#3027)

This fixes a regression from Python 2.  To get optional subparsers,
use the new parameter ``add_subparsers(required=False)``.

Patch by Anthony Sottile.
A
Anthony Sottile committed
aaf6fc0982c916cb71d9e0afcd7dda4ba495793b
Parent: 19e4d93
Committed by Éric Araujo <merwok@users.noreply.github.com> on 9/20/2017, 9:35:27 PM