Description of problem:

system-config-kickstart crash

Version-Release number of selected component (if applicable):
[root@linux ~]# uname -a
Linux linux 2.6.27.15-170.2.24.fc10.i686 #1 SMP Wed Feb 11 23:58:12 EST 2009 i686 athlon i386 GNU/Linux
[root@linux ~]# rpm -q system-config-kickstart
system-config-kickstart-2.7.20-1.fc10.noarch

How reproducible:
Always.

Steps to Reproduce:
1. [root@linux ~]# system-config-kickstart anaconda-ks.cfg
2. 
3.
  
Actual results:
system-config-kickstart crashes with...

Component: system-config-kickstart
Summary: TB1b31bf82 basic.py:238:applyKickstart:ValueError: list.index(x): x not in list

Traceback (most recent call last):
  File "/usr/share/system-config-kickstart/kickstartGui.py", line 315, in on_activate_open
    self.applyKickstart()
  File "/usr/share/system-config-kickstart/kickstartGui.py", line 339, in applyKickstart
    self.basic_class.applyKickstart()
  File "/usr/share/system-config-kickstart/basic.py", line 238, in applyKickstart
    self.timezone_combo.list.select_item(self.timezone_list.index(self.ks.timezone.timezone))
ValueError: list.index(x): x not in list

Local variables in innermost frame:
lang: Italian (Switzerland)
ksLang: en_US
self: <basic.basic instance at 0xb79876ec>

Expected results:
Should allow editing of anaconda-ks.cfg

Additional info: