Checks the return code of the common_options_handler. If it is truthy (i.e. not 0, EX_OK or None) command parsing stops and the return code is returned to the OS.
Checks the return code of the common_options_handler. If it is truthy (i.e. not 0, EX_OK or None) command parsing stops and the return code is returned to the OS.

abingham/docopt-subcommands