StGIT-0.11: Python exception when removing branch

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Every time I try to remove a branch I get:

{pts/0}% stg branch --delete stable
Deleting branch "stable"...
Traceback (most recent call last):
  File "/usr/bin/stg", line 43, in <module>
    main()
  File "/usr/lib/python2.5/site-packages/stgit/main.py", line 261, in main
    command.func(parser, options, args)
  File "/usr/lib/python2.5/site-packages/stgit/commands/branch.py", line 167, 
in func
    __delete_branch(args[0], options.force)
  File "/usr/lib/python2.5/site-packages/stgit/commands/branch.py", line 107, 
in __delete_branch
    doomed.delete(force)
  File "/usr/lib/python2.5/site-packages/stgit/stack.py", line 583, in delete
    if not os.listdir(self.__series_dir):
OSError: [Errno 2] No such file or directory: '.git/patches/stable'

Well, it is correct, stable has never had any patches, but why stg is so upset 
about it? :)

The state after this command is

{pts/2}% stg branch -l
Available branches:

s     cooker  |

  s     origin  |
        stable  |

It did not happen before; I am not sure whether it was introdied by StGIT or 
Pythn update.

Regards and happy new year

- -andrey
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