bug report on start up but everything seems fine

[eric]

After updating on Linux Mint, on start up the following message is displayed:

This is zim 0.66
Platform: posix
Locale: en_US UTF-8
FS encoding: UTF-8
Python: (2, 7, 6, 'final', 0)
Gtk: (2, 24, 23)
Pygtk: (2, 24, 0)
No bzr version-info found

======= Traceback =======
  File "/usr/lib/python2.7/dist-packages/zim/actions.py", line 240, in do_activate
    self.__get__(instance, instance.__class__)()
  File "/usr/lib/python2.7/dist-packages/zim/actions.py", line 211, in func
    self.func(instance, active)
  File "/usr/lib/python2.7/dist-packages/zim/gui/__init__.py", line 2088, in toggle_panes
    Window.save_uistate(self)
  File "/usr/lib/python2.7/dist-packages/zim/gui/widgets.py", line 2728, in save_uistate
    self.uistate[key] = self.get_pane_state(key)
  File "/usr/lib/python2.7/dist-packages/zim/config/dicts.py", line 542, in __setitem__
    raise KeyError('Config key "%s" has not been defined' % k)
KeyError: 'Config key "right_pane" has not been defined'

Closing out the error message results in zim appearing to be fine, but I just thought I'd post this here to see if it could be useful.

The following accompanies the above error with ''zim -D''

DEBUG: Action: toggle_panes(False)
ERROR: Exception during toggle action: toggle_panes(False)