Check replication status failed for non-replication

Need to check self.replication whether is None before the
function get_replication_status be called.

Closes-bug: #1365392

Change-Id: I6f6939a98091e40537f2355bb716b4b3205845e2

cinder/tests/test_storwize_svc.py

@@ -2796,6 +2796,15 @@ def test_storwize_initiator_target_map(self):
 
         self.assertEqual(term_data, term_ret)
 
+    def test_storwize_create_volume_with_replication_disable(self):
+        volume = self._generate_vol_info(None, None)
+
+        model_update = self.driver.create_volume(volume)
+        self.assertIsNone(model_update)
+
+        model_update = self.driver.get_replication_status(self.ctxt, volume)
+        self.assertIsNone(model_update)
+
     def test_storwize_create_volume_with_strech_cluster_replication(self):
         # Set replication flag, set pool openstack2 for secondary volume.
         self._set_flag('storwize_svc_stretched_cluster_partner', 'openstack2')

cinder/volume/drivers/ibm/storwize_svc/__init__.py

@@ -753,7 +753,10 @@ def create_replica_test_volume(self, tgt_volume, src_volume):
         return replica_status
 
     def get_replication_status(self, ctxt, volume):
-        return self.replication.get_replication_status(volume)
+        replica_status = None
+        if self.replication:
+            replica_status = self.replication.get_replication_status(volume)
+        return replica_status
 
     def _check_volume_copy_ops(self):
         LOG.debug("enter: update volume copy status")