Description of problem:
Unhandled Exception after using redhat-config-network

Version-Release number of selected component (if applicable):
1.3.10

How reproducible:
Occured while configuring etho card with GUI and particularly AFTER
adding Hosts on the Hosts tab

ALSO: "Activate device when computer starts" checkbox DOES NOT SAVE...
device won't automatically be activated on reboot

Steps to Reproduce:
1. Try to Add "Hosts" to the configuration GUI of etho device
2. Save and Close redhat-config-network
3.
  
Actual results:
"Exception occured popup windows saying:
Component: redhat-config-network
Version: 1.3.10
Summary: TB0b15cc2f redhat-control-network:302:hydrate:AttributeError:
'NoneType' object has no attribute 'clear'
Traceback (most recent call last):
  File "/usr/bin/redhat-control-network", line 426, in update_dialog
    self.hydrate()
  File "/usr/bin/redhat-control-network", line 302, in hydrate
    clist.clear()
AttributeError: 'NoneType' object has no attribute 'clear'

Local variables in innermost frame:
clist: None
self: <__main__.mainDialog instance at 0x8f14edc>
refresh: None


Expected results:
NULL - (not expecting any output from machine)

Additional info:
N/A