[issue17889] argparse subparsers break without arguments

[R. David Murray]

Changes by R. David Murray <rdmurray at bitdance.com>:


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resolution:  -> duplicate
stage:  -> committed/rejected
status: open -> closed
superseder:  -> Undocumented (?) behaviour change in argparse from 3.2.3 to 3.3.0

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue17889>
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