ycb_django_pr13658

what a new run launched now would send

ManagementUtility instantiates CommandParser without passing already-computed prog argument
Description
	
ManagementUtility ​goes to the trouble to parse the program name from the argv it's passed rather than from sys.argv: 
	def __init__(self, argv=None):
		self.argv = argv or sys.argv[:]
		self.prog_name = os.path.basename(self.argv[0])
		if self.prog_name == '__main__.py':
			self.prog_name = 'python -m django'
But then when it needs to parse --pythonpath and --settings, it ​uses the program name from sys.argv: 
		parser = CommandParser(usage='%(prog)s subcommand [options] [args]', add_help=False, allow_abbrev=False)
Above "%(prog)s" ​refers to sys.argv[0]. Instead, it should refer to self.prog_name. This can fixed as follows:
		parser = CommandParser(
			prog=self.prog_name,
			usage='%(prog)s subcommand [options] [args]',
			add_help=False,
			allow_abbrev=False)
I'm aware that execute_from_command_line is a private API, but it'd be really convenient for me if it worked properly in my weird embedded environment where sys.argv[0] is ​incorrectly None. If passing my own argv to execute_from_command_line avoided all the ensuing exceptions, I wouldn't have to modify sys.argv[0] globally as I'm doing in the meantime.

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