Description of problem:
Installation of FC6T3 aborts at Network setup step if "Use DHCP" in the device 
dialog is unchecked and nothing is input in the IP fields.

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


How reproducible:


Steps to Reproduce:
1. Go through default install steps until reaching Network devices setup step
2. Select a device (ie "eth0") and click Edit
3. Uncheck the "Use DHCP" checkbox
4. Click OK
  
Actual results:
Installation aborts because of unhandled exception


Expected results:
Input validation of required fields that are empty or bogus

Additional info:

Traceback (most recent call first):
  File "/usr/lib/anaconda/iw/network_gui.py", line 456, in editDevice
    if int(val) > 32 or int(val) < 0:
ValueError: invalid literal for int():