Description of problem:
Editing rules of firewalld wrom UI.

Version-Release number of selected component:
firewall-config-0.3.13-2.fc21

Additional info:
reporter:       libreport-2.3.0
cmdline:        /usr/bin/python -Es /usr/bin/firewall-config
executable:     /usr/bin/firewall-config
kernel:         3.18.5-201.fc21.x86_64
runlevel:       N 5
type:           Python
uid:            1000

Truncated backtrace:
firewall-config:3662:onChangeService:AttributeError: 'NoneType' object has no attribute 'getSettings'

Traceback (most recent call last):
  File "/usr/bin/firewall-config", line 3662, in onChangeService
    settings = service.getSettings()
AttributeError: 'NoneType' object has no attribute 'getSettings'

Local variables in innermost frame:
destination: {}
service: None
active_service: 'gre'
self: <__main__.FirewallConfig object at 0x7f394f61da50>
args: (<TreeSelection object at 0x7f394d24fd20 (GtkTreeSelection at 0x2ab3b00)>,)
modules: []
ports: []