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Description of problem:
When attempting to create a RAID device in the text installer, changes in the
filesystem type gets the installer dump a stack trace and abort.

Version-Release number of selected component (if applicable):


How reproducible:
Always

Steps to Reproduce:
1.Boot installer in `text' mode.
2.Verify that /dev/hda8 and /dev/hdc1 are existing Software R[aid] partitions
3.Choose RAID to create a RAID device out of them
4.Type up-arrow, or down-arrow then up-arrow, or 3 times down-arrow, in the
Filesystem type box
	

Actual Results:  Just after selecting a mountable filesystem type such as ext2
or ext3 (i.e., not LVM or swap), the installer presumably attempts to verify
whether a previously-existing partition is mount-compatible with the selection.
 In the case of a new RAID device, there's no `oldMount' attribute in the
partition object, so it dumps a stack trace:

File "/usr/lib/anaconda/textw/partition_text.py", line 201, in fstypeSetCB
  self.fstypeSet((listbox.current(), entry))
File "/usr/lib/anaconda/textw/partition_text.py", line 192, in fstypeSet
  if self.oldMount:
AttributeError: PartitionWindow instance has no attribute 'oldMount'


Expected Results:  It should check whether self.oldMount exists before accessing
it, or this attribute should always be set.

Additional info: