Created attachment 565084 [details]
shows the error whiele the networks file is selected

Description of problem:
I create a virtual network attached to a bridge device
xml file contents(builders.xml):

<network>
  <name>builders</name>
  <uuid>b1b9d7c6-f620-048f-71ee-ca3ba1ac3e98</uuid>
  <forward mode='bridge'/>
  <bridge name='br2' />
</network>

but if I select that network (builders) in virt-manager "Virtual Networks" tab:
the following error shows

Error selecting network: 'NoneType' object has not attribute split


Version-Release number of selected component (if applicable):
virt-manager-0.9.1-2.fc16.noarch
libvirt-0.9.6-4.fc16.x86_64
libvirt-client-0.9.6-4.fc16.x86_64
libvirt-python-0.9.6-4.fc16.x86_64


How reproducible:

always

Steps to Reproduce:
1. create a network description file as per http://libvirt.org/formatnetwork.html#examplesBridge

2. select the network in virt-manager "Virtual Networks" tab
  
thanks in advance, 

Gabriel