[issue37910] argparse wrapping fails with metavar="" (no metavar)

[Sam Franklin]

Sam Franklin <sjfranklin24 at gmail.com> added the comment:

Paul, very true. If I find time I may take a look at rewriting it as you suggest.
For the moment, though, there's a relatively simple change that opens up a range of allowable whitespace characters. It's still a bandage, but it covers decent-sized area and should be easily backported. What do you think of the pull request? It's passed a first review.

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<https://bugs.python.org/issue37910>
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