Comment 2 for bug 583554

Traceback:
 Traceback (most recent call last):
   File "/usr/lib/python2.6/dist-packages/bzrlib/commands.py", line 853, in exception_to_return_code
     return the_callable(*args, **kwargs)
   File "/usr/lib/python2.6/dist-packages/bzrlib/commands.py", line 1055, in run_bzr
     ret = run(*run_argv)
   File "/usr/lib/python2.6/dist-packages/bzrlib/commands.py", line 661, in run_argv_aliases
     return self.run_direct(**all_cmd_args)
   File "/usr/lib/python2.6/dist-packages/bzrlib/commands.py", line 665, in run_direct
     return self._operation.run_simple(*args, **kwargs)
   File "/usr/lib/python2.6/dist-packages/bzrlib/cleanup.py", line 122, in run_simple
     self.cleanups, self.func, *args, **kwargs)
   File "/usr/lib/python2.6/dist-packages/bzrlib/cleanup.py", line 156, in _do_with_cleanups
     result = func(*args, **kwargs)
   File "/usr/lib/python2.6/dist-packages/bzrlib/plugins/gtk/commands.py", line 293, in run
     dlg = CommitDialog(wt)
   File "/usr/lib/python2.6/dist-packages/bzrlib/plugins/gtk/commit.py", line 132, in __init__
     self._saved_commit_messages_manager = SavedCommitMessagesManager(self._wt, self._wt.branch)
   File "/usr/lib/python2.6/dist-packages/bzrlib/plugins/gtk/commit.py", line 815, in __init__
     config = branch.get_config()._get_branch_data_config()
 AttributeError: 'BranchConfig' object has no attribute '_get_branch_data_config'

IMO, using private methods in GUI is not the best idea?