Cannot run dbx_preference if selected theme is missing

[Faheem Pervez]

Hi,

Minor bug: If you install an external theme (in my case it was the Deep theme), choose it from the preferences, close the preferences window, remove the external theme and then try to open up dbx_preference again, you'll be greeted with the following:

Traceback (most recent call last):
  File "/usr/bin/dbx_preference", line 2032, in <module>
    PrefDialog()
  File "/usr/bin/dbx_preference", line 219, in __init__
    self.popup_style = PopupStyle()
  File "/usr/lib/python2.7/site-packages/dockbarx/theme.py", line 382, in __init__
    self.on_style_changed()
  File "/usr/lib/python2.7/site-packages/dockbarx/theme.py", line 407, in on_style_changed
    elif self.globals.default_popup_style in styles:
AttributeError: 'Globals' object has no attribute 'default_popup_style'

Running "gconftool-2 -s /apps/dockbarx/theme -t string DBX" allowed me to launch dbx_preference again.

Reproducibility: Always (run "gconftool-2 -s /apps/dockbarx/theme -t string DBX1", for example)
Running: DockbarX BZR revision 479 in Xfce (Xfapplet) on Arch Linux

Thanks for DockbarX.