Zim 0.66 throws error when started with side-pane disabled

[Shivam Sharma]

I like to keep my side-pane disabled using "F9" key. In the new Zim version, whenever I am starting Zim with side-pane disabled, it throws some error. However, it starts fine after that. So, it doesn't seem a critical bug. However, I can confirm this bug because I tried this in a virtual machine with two different Zim versions: 0.60 and 0.66. The bug appears in the latter.

Error reported is this:

This is zim 0.66
Platform: posix
Locale: en_GB UTF-8
FS encoding: UTF-8
Python: (2, 7, 12, 'final', 0)
Gtk: (2, 24, 30)
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'

[eric (ehremington)]

This is the same as #1692722. I could not figure out what was causing the bug, but I'm glad you found it. Seems that a fix has been committed per the comment on my report.