Traceback (most recent call last):
  File "/home/boris/openstack/nova/nova/tests/test_libvirt.py", line 2512, in test_spawn_with_network_info
    network_info=network_info)
  File "/home/boris/openstack/nova/nova/virt/libvirt/driver.py", line 1192, in spawn
    block_device_info=block_device_info)
  File "/home/boris/openstack/nova/nova/virt/libvirt/driver.py", line 1974, in to_xml
    disk_info, rescue, block_device_info)
  File "/home/boris/openstack/nova/nova/virt/libvirt/driver.py", line 1825, in get_guest_config
    guest.sysinfo = self.get_guest_config_sysinfo(instance)
  File "/home/boris/openstack/nova/nova/virt/libvirt/driver.py", line 1767, in get_guest_config_sysinfo
    sysinfo.system_version = version.version_string_with_package()
  File "/home/boris/openstack/nova/nova/version.py", line 87, in version_string_with_package
    return version_info.version_string()
  File "/home/boris/openstack/nova/nova/openstack/common/version.py", line 63, in version_string
    for part in self.release_string().split('.'):
AttributeError: 'NoneType' object has no attribute 'split'