[issue29298] argparse fails with required subparsers, un-named dest, and empty argv

[Ben Sokol]

Change by Ben Sokol <python at bensokol.com>:


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type: behavior -> crash
versions: +Python 3.8, Python 3.9

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue29298>
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