DoesNotExist: NodeGroupInterface has no nodegroup

[Diogo Matsubara]

CI tests are broken since rev 2535 landed as seen here: http://d-jenkins.ubuntu-ci:8080/view/MAAS/job/utopic-adt-maas/194/artifact/results/artifacts/maas-logs/var/log/maas/maas.log/*view*/

ERROR 2014-07-10 06:15:18,395 maasserver ################################ Exception: NodeGroupInterface has no nodegroup. ################################
ERROR 2014-07-10 06:15:18,398 maasserver Traceback (most recent call last):
  File "/usr/lib/python2.7/dist-packages/django/core/handlers/base.py", line 112, in get_response
    response = wrapped_callback(request, *callback_args, **callback_kwargs)
  File "/usr/lib/python2.7/dist-packages/django/views/decorators/vary.py", line 19, in inner_func
    response = func(*args, **kwargs)
  File "/usr/lib/python2.7/dist-packages/piston/resource.py", line 167, in __call__
    result = self.error_handler(e, request, meth, em_format)
  File "/usr/lib/python2.7/dist-packages/piston/resource.py", line 165, in __call__
    result = meth(request, *args, **kwargs)
  File "/usr/lib/python2.7/dist-packages/maasserver/api_support.py", line 189, in dispatch
    return function(self, request, *args, **kwargs)
  File "/usr/lib/python2.7/dist-packages/maasserver/api.py", line 1542, in register
    nodegroup = register_nodegroup(request, uuid)
  File "/usr/lib/python2.7/dist-packages/maasserver/api.py", line 1448, in register_nodegroup
    if not form.is_valid():
  File "/usr/lib/python2.7/dist-packages/django/forms/forms.py", line 129, in is_valid
    return self.is_bound and not bool(self.errors)
  File "/usr/lib/python2.7/dist-packages/django/forms/forms.py", line 121, in errors
    self.full_clean()
  File "/usr/lib/python2.7/dist-packages/maasserver/forms.py", line 170, in full_clean
    super(APIEditMixin, self).full_clean()
  File "/usr/lib/python2.7/dist-packages/django/forms/forms.py", line 273, in full_clean
    self._clean_fields()
  File "/usr/lib/python2.7/dist-packages/django/forms/forms.py", line 291, in _clean_fields
    value = getattr(self, 'clean_%s' % name)()
  File "/usr/lib/python2.7/dist-packages/maasserver/forms.py", line 1358, in clean_interfaces
    validate_nodegroupinterface_definition(interface)
  File "/usr/lib/python2.7/dist-packages/maasserver/forms.py", line 1270, in validate_nodegroupinterface_definition
    if not form.is_valid():
  File "/usr/lib/python2.7/dist-packages/django/forms/forms.py", line 129, in is_valid
    return self.is_bound and not bool(self.errors)
  File "/usr/lib/python2.7/dist-packages/django/forms/forms.py", line 121, in errors
    self.full_clean()
  File "/usr/lib/python2.7/dist-packages/maasserver/forms.py", line 170, in full_clean
    super(APIEditMixin, self).full_clean()
  File "/usr/lib/python2.7/dist-packages/django/forms/forms.py", line 274, in full_clean
    self._clean_form()
  File "/usr/lib/python2.7/dist-packages/django/forms/forms.py", line 300, in _clean_form
    self.cleaned_data = self.clean()
  File "/usr/lib/python2.7/dist-packages/maasserver/forms.py", line 1193, in clean
    cleaned_data['name'] = self.compute_name()
  File "/usr/lib/python2.7/dist-packages/maasserver/forms.py", line 1181, in compute_name
    cluster = self.instance.nodegroup
  File "/usr/lib/python2.7/dist-packages/django/db/models/fields/related.py", line 326, in __get__
    "%s has no %s." % (self.field.model.__name__, self.field.name))
DoesNotExist: NodeGroupInterface has no nodegroup.

The test broken is maas-integration.TestMAASIntegration.test_cluster_connected and it's using the following CLI command:
# maas maas node-groups list

The test expects that the nodegroup object return its uuid rather than the string master which never happens and is likely related to the traceback above.