Add git cl lol.

subcommand.py

 # Copyright 2013 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 """Manages subcommands in a script.
 
 Each subcommand should look like this:
   @usage('[pet name]')
   def CMDpet(parser, args):
     '''Prints a pet.
@@ skipping 174 matching lines @@
       parser.description += self._gen_commands_list()
       # Do not touch epilog.
     else:
       # Use the command's docstring if available. For commands, unlike module
       # docstring, realign.
       lines = (command.__doc__ or '').rstrip().splitlines()
       if lines[:1]:
         rest = textwrap.dedent('\n'.join(lines[1:]))
         parser.description = '\n'.join((lines[0], rest))
       else:
-        parser.description = lines[0]
+        parser.description = lines[0] if lines else ''
       if parser.description:
         parser.description += '\n'
       parser.epilog = getattr(command, 'epilog', None)
       if parser.epilog:
         parser.epilog = '\n' + parser.epilog.strip() + '\n'
 
     more = getattr(command, 'usage_more', '')
     parser.set_usage(
         'usage: %%prog %s [options]%s' % (name, '' if not more else ' ' + more))
 
@@ skipping 39 matching lines @@
         return command(parser, args[1:])
 
     cmdhelp = self.enumerate_commands().get('help')
     if cmdhelp:
       # Not a known command. Default to help.
       self._add_command_usage(parser, cmdhelp)
       return cmdhelp(parser, args)
 
     # Nothing can be done.
     return 2