Description of problem:
I use virt-manager 1.0.1 with spice-client-gtk fully installed. When I start to change display server from VNC to spice, it shows below error. I did not get it, when I use 0.9.5, spice works fine. VNC also works fine for me in 1.0.1.
unsupported configuration: unknown graphics device type '<gi.overrides.Gtk.TreeModelRow object at 0x7f3504081f50>'

Version-Release number of selected component (if applicable):
1.0.1

How reproducible:


Steps to Reproduce:
1. Install latest virt-manager 1.0,1
2. Change already exists guest display configuration from VNC to spice
3.

Actual results:
Change VM configuration error：unsupported configuration: unknown graphics device type '<gi.overrides.Gtk.TreeModelRow object at 0x7f350c18b490>'

Expected results:
It should be OK

Additional info:
Change VM configuration error：unsupported configuration: unknown graphics device type '<gi.overrides.Gtk.TreeModelRow object at 0x7f350c18b490>'

Traceback (most recent call last):
  File "/usr/share/virt-manager/virtManager/details.py", line 2310, in _change_config_helper
    self.vm.redefine_cached()
  File "/usr/share/virt-manager/virtManager/libvirtobject.py", line 213, in redefine_cached
    self._redefine_xml(xml)
  File "/usr/share/virt-manager/virtManager/libvirtobject.py", line 238, in _redefine_xml
    return self._redefine_helper(origxml, newxml)
  File "/usr/share/virt-manager/virtManager/libvirtobject.py", line 230, in _redefine_helper
    self._define(newxml)
  File "/usr/share/virt-manager/virtManager/domain.py", line 1012, in _define
    self.conn.define_domain(newxml)
  File "/usr/share/virt-manager/virtManager/connection.py", line 787, in define_domain
    return self._backend.defineXML(xml)
  File "/usr/lib/python2.7/dist-packages/libvirt.py", line 3237, in defineXML
    if ret is None:raise libvirtError('virDomainDefineXML() failed', conn=self)
libvirtError: unsupported configuration: unknown graphics device type '<gi.overrides.Gtk.TreeModelRow object at 0x7f350c18b490>'