gh-101640: Make argparse _print_message catch any write error (#101802)

* In particular, don't exit when trying to print to stderr = None.
* Add tests

Co-authored-by: Terry Jan Reedy <tjreedy@udel.edu>

Oleg Iarygin committed 2y ago

42f54d1f9244784fec99e0610aa05a5051e594bb

Parent: 92d8bff

Committed by GitHub <noreply@github.com> on 5/6/2023, 10:53:48 PM