Comment 2 for bug 989249

Excerpt from debug log when that crash occurs
"""
Apr 27 07:01:11 ubiquity: Partman: Thawing choices for choose_partition
Apr 27 07:01:11 ubiquity: already found path /dev/sda-1 with type free
Apr 27 07:01:11 ubiquity: device path: /dev/sda, fstype: free, grub installable? no
Apr 27 07:01:11 ubiquity: device path: /dev/sdb, fstype: free, grub installable? no
Apr 27 07:01:11 ubiquity: device path: /dev/sdb1, fstype: unknown, grub installable? no
Apr 27 07:01:11 ubiquity: device path: /dev/sdb grub installable? yes
Apr 27 07:01:11 ubiquity: device path: /dev/sda grub installable? yes
Exception in KDE frontend (invoking crash handler):
Traceback (most recent call last):
  File "/usr/lib/ubiquity/ubiquity/frontend/kde_components/PartitionModel.py", line 100, in parent
    parentItem = childItem.parent()
  File "/usr/lib/ubiquity/ubiquity/frontend/kde_components/PartitionModel.py", line 166, in parent
    return self.parentItem
AttributeError: TreeItem instance has no attribute 'parentItem'

KCrash: Application '' crashing...
KCrash: Attempting to start /usr/lib/kde4/libexec/drkonqi from kdeinit
"""