Make ASG resource work when no lb is specified

Change-Id: I0a5a2b62ad1a81f0201d6cd8202bd6e11f7c569c
Closes-Bug: #1535778

contrib/rackspace/rackspace/resources/auto_scale.py

@@ -121,6 +121,7 @@ class Group(resource.Resource):
             _('List of load balancers to hook the '
               'server up to. If not specified, no '
               'load balancing will be configured.'),
+            default=[],
             schema=properties.Schema(
                 properties.Schema.MAP,
                 schema={
@@ -292,15 +293,14 @@ class Group(resource.Resource):
         server_args = lcargs[self.LAUNCH_CONFIG_ARGS_SERVER]
         lb_args = lcargs.get(self.LAUNCH_CONFIG_ARGS_LOAD_BALANCERS)
         lbs = copy.deepcopy(lb_args)
-        if lbs:
-            for lb in lbs:
-                # if the port is not specified, the lbid must be that of a
-                # RackConnectV3 lb pool.
-                if not lb[self.LAUNCH_CONFIG_ARGS_LOAD_BALANCER_PORT]:
-                    del lb[self.LAUNCH_CONFIG_ARGS_LOAD_BALANCER_PORT]
-                    continue
-                lbid = int(lb[self.LAUNCH_CONFIG_ARGS_LOAD_BALANCER_ID])
-                lb[self.LAUNCH_CONFIG_ARGS_LOAD_BALANCER_ID] = lbid
+        for lb in lbs:
+            # if the port is not specified, the lbid must be that of a
+            # RackConnectV3 lb pool.
+            if not lb[self.LAUNCH_CONFIG_ARGS_LOAD_BALANCER_PORT]:
+                del lb[self.LAUNCH_CONFIG_ARGS_LOAD_BALANCER_PORT]
+                continue
+            lbid = int(lb[self.LAUNCH_CONFIG_ARGS_LOAD_BALANCER_ID])
+            lb[self.LAUNCH_CONFIG_ARGS_LOAD_BALANCER_ID] = lbid
         personality = server_args.get(
             self.LAUNCH_CONFIG_ARGS_SERVER_PERSONALITY)
         if personality:

contrib/rackspace/rackspace/tests/test_auto_scale.py

@@ -313,7 +313,7 @@ Resources:
                 'flavor': 'flavor-ref',
                 'image': 'image-ref',
                 'launch_config_type': 'launch_server',
-                'load_balancers': None,
+                'load_balancers': [],
                 'key_name': "my-key",
                 'max_entities': 25,
                 'group_metadata': {'group': 'metadata'},
@@ -757,3 +757,31 @@ class AutoScaleGroupValidationTests(common.HeatTestCase):
             mock.Mock(id='pool_exists'),
         ]
         self.assertIsNone(asg.validate())
+
+    def test_validate_no_lb_specified(self, mock_client, mock_plugin):
+        asg_properties = {
+            "groupConfiguration": {
+                "name": "My Group",
+                "cooldown": 60,
+                "minEntities": 1,
+                "maxEntities": 25,
+                "metadata": {
+                    "group": "metadata",
+                },
+            },
+            "launchConfiguration": {
+                "type": "launch_server",
+                "args": {
+                    "server": {
+                        "name": "sdfsdf",
+                        "flavorRef": "ffdgdf",
+                        "imageRef": "image-ref",
+                        },
+                    },
+                },
+            }
+        rsrcdef = rsrc_defn.ResourceDefinition(
+            "test", auto_scale.Group, properties=asg_properties)
+        asg = auto_scale.Group("test", rsrcdef, self.mockstack)
+
+        self.assertIsNone(asg.validate())