Description of problem:

we have witness case where 'images' links are missing from domain after connect storage pool is called in case recover vm was called before the pool reconnection. 

- host runs 100 vms 
- vdsmd is restarted 
- pool is reconnected
- vms are in pause 
- try to send continue command using vdsClient 
 Thread-2690::DEBUG::2012-02-26 16:21:35,390::BindingXMLRPC::848::vds::(wrapper) client [10.35.115.11]::call vmCont with ('b01ae304-a779-430c-b3a4-061c5fbfd5be',) {}
Thread-2690::ERROR::2012-02-26 16:21:35,393::BindingXMLRPC::863::vds::(wrapper) Traceback (most recent call last):
  File "/usr/share/vdsm/BindingXMLRPC.py", line 853, in wrapper
    res = f(*args, **kwargs)
  File "/usr/share/vdsm/BindingXMLRPC.py", line 215, in vmCont
    return vm.cont()
  File "/usr/share/vdsm/API.py", line 108, in cont
    return v.cont()
  File "/usr/share/vdsm/vm.py", line 822, in cont
    self._underlyingCont()
  File "/usr/share/vdsm/libvirtvm.py", line 1534, in _underlyingCont
    hooks.before_vm_cont(self._dom.XMLDesc(0), self.conf)
AttributeError: 'NoneType' object has no attribute 'XMLDesc'

ll /rhev/data-center/711a080f-4702-450c-9f5f-bf54f1e99383/45290416-1dd4-494d-8ac9-29471752bd21/images/