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Description of problem:
when connected to the same host (RHEL 6.3), virt-managers shows empty list of VMs in some circumstances

Version-Release number of selected component (if applicable):
virt-manager-0.9.0-8.el6.x86_64
python-2.6.6-29.el6.x86_64

How reproducible:


Steps to Reproduce:
1. run virt-manager --debug
2. connect to the hypervisor
3.
  
Actual results:
virt-manager prints to log stuff like this:
2012-02-07 16:04:15,959 (cli:85): Traceback (most recent call last):
  File "/usr/share/virt-manager/virtManager/manager.py", line 683, in vm_added
    self._append_vm(model, vm, conn)
  File "/usr/share/virt-manager/virtManager/manager.py", line 754, in _append_vm
    row = self._build_vm_row(vm)
  File "/usr/share/virt-manager/virtManager/manager.py", line 736, in _build_vm_row
    row.insert(ROW_HINT, util.xml_escape(vm.get_description()))
  File "/usr/lib/python2.6/site-packages/virtinst/util.py", line 278, in xml_escape
    str = str.replace("&", "&")
AttributeError: 'NoneType' object has no attribute 'replace'


Expected results:
there are no tracebacks and list of VMs is shown

Additional info:

*** This bug has been marked as a duplicate of bug 786672 ***