stgit: cannot push a patch - Python trace dump

Hi all,

I'm preparing patches for upstream and am haunted by an apparent patch breaking
stg. The problem appears to be one or more of my patches breaking a push:

$ stg push
Traceback (most recent call last):
   File "/usr/bin/stg", line 43, in ?
     main()
   File "/usr/lib/python2.4/site-packages/stgit/main.py", line 255, in main
     command.func(parser, options, args)
   File "/usr/lib/python2.4/site-packages/stgit/commands/push.py", line 101, in
func
     push_patches(patches, options.merged)
   File "/usr/lib/python2.4/site-packages/stgit/commands/common.py", line 160,
in push_patches
     forwarded = crt_series.forward_patches(patches)
   File "/usr/lib/python2.4/site-packages/stgit/stack.py", line 789, in
forward_patches
     committer_email = committer_email)
   File "/usr/lib/python2.4/site-packages/stgit/git.py", line 439, in commit
     if message[-1:] != '\n':
TypeError: unsubscriptable object


I've been abusing stg by leaving the commit messages empty so I assume that
that's the cause here, or related to the problem.

This happens with today's stg as well as stg-0.10

After scraping all my patches out manually and adding meaningfull (non-empty) 
commit messages I seem to be able to push and pop them all again.

Cheers,

Auke