Description of problem:
If the user attempts to start the LiveCD installer on a machine that has a
non-supported/broken/problamtic chipset, the instalelr throws a meaningless (to
the user) exception and aborts, instead of displaying a meaningful message. ("No
disk detected. Please load the appropriate chipset drivers")
Relates to this  bug.
Committed some changes to anaconda a few minutes ago that should make this case
work a little better.