vmware attributes -- fix for None value after upgrade

Change-Id: Iec17bf2e76674ae1a619b647382fcd72555a1bce
Closes-Bug: #1450049

nailgun/nailgun/statistics/fuel_statistics/installation_info.py

@@ -138,6 +138,9 @@ class InstallationInfo(object):
             release = cluster.release
             nodes_num = NodeCollection.filter_by(
                 None, cluster_id=cluster.id).count()
+            vmware_attributes_editable = None
+            if cluster.vmware_attributes:
+                vmware_attributes_editable = cluster.vmware_attributes.editable
             cluster_info = {
                 'id': cluster.id,
                 'nodes_num': nodes_num,
@@ -153,7 +156,7 @@ class InstallationInfo(object):
                 'attributes': self.get_attributes(cluster.attributes.editable,
                                                   self.attributes_white_list),
                 'vmware_attributes': self.get_attributes(
-                    cluster.vmware_attributes.editable,
+                    vmware_attributes_editable,
                     self.vmware_attributes_white_list
                 ),
                 'net_provider': cluster.net_provider,

nailgun/nailgun/test/unit/fuel_statistics_tests/test_installation_info.py

@@ -22,6 +22,7 @@ from nailgun.db.sqlalchemy.models import cluster as cluster_model
 from nailgun.db.sqlalchemy.models import plugins
 from nailgun.objects import Cluster
 from nailgun.objects import ReleaseCollection
+from nailgun.objects import VmwareAttributes
 from nailgun.settings import settings
 from nailgun.statistics.fuel_statistics.installation_info \
     import InstallationInfo
@@ -86,6 +87,28 @@ class TestInstallationInfo(BaseTestCase):
             result = info.get_attributes(attrs, info.attributes_white_list)
             self.assertDictEqual({}, result)
 
+    def test_clusters_info_no_vmware_attributes_exception(self):
+        self.env.upload_fixtures(['openstack'])
+        info = InstallationInfo()
+        release = ReleaseCollection.filter_by(None, operating_system='CentOS')
+        nodes_params = [
+            {'roles': ['compute']},
+            {'roles': ['compute']},
+            {'roles': ['controller']}
+        ]
+        self.env.create(
+            cluster_kwargs={
+                'release_id': release[0].id,
+                'mode': consts.CLUSTER_MODES.ha_full,
+                'net_provider': consts.CLUSTER_NET_PROVIDERS.nova_network},
+            nodes_kwargs=nodes_params
+        )
+        self.env.create_node({'status': consts.NODE_STATUSES.discover})
+        cluster = self.env.clusters[0]
+        VmwareAttributes.delete(cluster.vmware_attributes)
+        self.env.db.flush()
+        self.assertNotRaises(AttributeError, info.get_clusters_info)
+
     def test_clusters_info(self):
         self.env.upload_fixtures(['openstack'])
         info = InstallationInfo()