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Description of problem:
If /etc/fstab has a typo in it like a 0 on a line alone anaconda will crash when
trying to mount filesystems to /mnt/sysimage. Booting into RedHat Linux normally
with this typo causes alot of error messages, but boots normally.

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


How reproducible:
Always

Steps to Reproduce:
1. Add a zero character on it's own line in /etc/fstab
2. Reboot
3. Boot off RedHat Linux 7.2.92 CD1
4. Enter   linux rescue  at the boot: prompt
5. Select Skip when asked if you want to check the cd
6. Select Continue when asked if you want to mount filesystems to /mnt/sysimage
	

Actual Results:  Anaconda crashs with a traceback

Expected Results:  Anaconda to either gracefully abort and refuse to mount the
filesystems or to workaround the typo and continue as it normally work, along
with error messages about a invalid entry in fstab.

Additional info:

I ran into this after I reorganized /etc/fstab to be more readable and added
comments as to what each entry's corrsponding device filename was in comments.
In the process I cut and paste the cdrom entries and produced a line with just a
zero on it.