<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:

def _bse_cli_list_roles(args):
    '''Handles the list-roles subcommand'''
    all_roles = api.get_roles()

    if args.no_description:
        liststr = all_roles.keys()
    else:
        liststr = format_columns(all_roles.items())

    return '\n'.join(liststr)