oem config prepare crashes on kde

Binary package hint: ubiquity

on every one of our kde machines regardless of hardware, we get an error on loading after running oem-config-prepare

we can't click on the 'file a bug report' icon because this is prior to the desktop loading. it's an oem config prepare bug. however, the message says:

Traceback (most recent call last):
 File "/usr/lib/ubiquity/plugins/ubi-language.py", line 621, in on_language_selection_changed
   self.update_release_notes_label()
 File "/usr/lib/ubiquity/plugins/ubi-language.py", line 636, in update_release_notes_label
   if self.release_notes_found and self.update_installer:
AttributeError: 'PageKde' object has no attribute 'release_notes_found'

That's it. I think I typed that all correctly.
This means we can't install kde on our prebuilt linux computers, which means we can't offer kde as an operating system. Please let's fix this so we can get kde to more people. Otherwise we're happy to just install gnome on our computers.

Note that I can't attach the var/log/ etc files as the system breaks at this point and I can do nothing with it. I can't get to a desktop when the installer crashes, so I can't run a bug report from the computer having the problem.