Traceback (most recent call last):
  File "/usr/share/software-center/softwarecenter/view/appdetailsview.py", line 125, in _on_cache_ready
    self.show_app(self.app)
  File "/usr/share/software-center/softwarecenter/view/appdetailsview_gtk.py", line 1484, in show_app
    self._update_page(self.app_details)
  File "/usr/share/software-center/softwarecenter/view/appdetailsview_gtk.py", line 1369, in _update_page
    self._configure_where_is_it()
  File "/usr/share/software-center/softwarecenter/view/appdetailsview_gtk.py", line 1434, in _configure_where_is_it
    elif os.path.exists(iconname):
  File "/usr/lib/python2.6/genericpath.py", line 18, in exists
    st = os.stat(path)
TypeError: coercing to Unicode: need string or buffer, NoneType found