Description of problem:

On RHEL6, virt-who crashes with VirtError message when create new VM.

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

  - RHEL6.5
  - virt-who-0.8-9.el6.noarch  
  - libvirt-0.10.2-29.el6.x86_64
  - libvirt-client-0.10.2-29.el6.x86_64
  - libvirt-python-0.10.2-29.el6.x86_64

How reproducible:
  No reproducer

Actual results:

  The following messages were written in /var/log/messages:

  kernel: device vnet4 entered promiscuous mode
  kernel: virbr0: topology change detected, propagating
  kernel: virbr0: port 2(vnet4) entering forwarding state
  qemu-kvm: Could not find keytab file: /etc/qemu/krb5.tab: No such file or directory
  abrt: detected unhandled Python exception in '/usr/share/virt-who/virt-who.py'
  abrtd: New client connected
  abrt-server[22680]: Saved Python crash dump of pid 5291 to /var/spool/abrt/pyhook-2014-03-18-09:05:55-5291
  abrtd: Directory 'pyhook-2014-03-18-09:05:55-5291' creation detected


  The following files is in ABRT report:

  -- backtrace --
  Traceback (most recent call last):
    File "/usr/lib64/python2.6/site-packages/libvirt.py", line 3571, in _dispatchDomainEventCallbacks
      cb(self,dom,event,detail,opaque)
    File "/usr/share/virt-who/virt.py", line 74, in changed
      l = self.listDomains()
    File "/usr/share/virt-who/virt.py", line 64, in listDomains
      raise VirtError(str(e))
  
    VirtError: invalid connection pointer in virConnectNumOfDomains
  
  Local variables in innermost frame:
  domains: []
  self: <virt.Virt instance at 0x18b50e0>
  e: libvirtError('invalid connection pointer in virConnectNumOfDomains',)

  -- reason --
  virt.py:64:listDomains:VirtError: invalid connection pointer in virConnectNumOfDomains


Expected results:
  It shouldn't appear error message.

Additional info:
  It looks similarly to bugid:1004247.