gh-96310: Fix a traceback in argparse when all options in a mutually exclusive group are suppressed#96311

serhiy-storchaka merged 3 commits intopython:mainpython/cpython:mainfrom

dmach:fix-argparse-subparser_all_mutually_exclusive_group_members_suppresseddmach/cpython:fix-argparse-subparser_all_mutually_exclusive_group_members_suppressedCopy head branch name to clipboard