Return None for attributes of sd with no actions

If the 'actions' property of a deployment is [], we don't
create a software deployment in heat and resource_id of the
software deployment is None. However, there is a possibility
that we access the attributes of the sd in the template and
that results in TypeError as we try to make an rpc call to
show the software deployment for None.

Change-Id: Iefd3cdd20bb51c63e7267ae0628e0f15544c0427
Task: 33516

heat/engine/resources/openstack/heat/software_deployment.py

@@ -545,12 +545,13 @@ class SoftwareDeployment(signal_responder.SignalResponder):
 
     def get_attribute(self, key, *path):
         """Resource attributes map to deployment outputs values."""
-        sd = self.rpc_client().show_software_deployment(
-            self.context, self.resource_id)
-        ov = sd[rpc_api.SOFTWARE_DEPLOYMENT_OUTPUT_VALUES] or {}
-        if key in ov:
-            attribute = ov.get(key)
-            return attributes.select_from_attribute(attribute, path)
+        if self.resource_id is not None:
+            sd = self.rpc_client().show_software_deployment(
+                self.context, self.resource_id)
+            ov = sd[rpc_api.SOFTWARE_DEPLOYMENT_OUTPUT_VALUES] or {}
+            if key in ov:
+                attribute = ov.get(key)
+                return attributes.select_from_attribute(attribute, path)
 
         # Since there is no value for this key yet, check the output schemas
         # to find out if the key is valid

heat/tests/openstack/heat/test_software_deployment.py

@@ -201,7 +201,6 @@ class SoftwareDeploymentTest(common.HeatTestCase):
         get_ec2_signed_url.return_value = 'http://192.0.2.2/signed_url'
 
         self.deployment = self.stack['deployment_mysql']
-
         self.rpc_client = mock.MagicMock()
         self.deployment._rpc_client = self.rpc_client
 
@@ -1097,6 +1096,7 @@ class SoftwareDeploymentTest(common.HeatTestCase):
 
     def test_fn_get_att(self):
         self._create_stack(self.template)
+        self.deployment.resource_id = 'c8a19429-7fde-47ea-a42f-40045488226c'
         mock_sd = {
             'outputs': [
                 {'name': 'failed', 'error_output': True},
@@ -1132,6 +1132,7 @@ class SoftwareDeploymentTest(common.HeatTestCase):
 
     def test_fn_get_att_error(self):
         self._create_stack(self.template)
+        self.deployment.resource_id = 'c8a19429-7fde-47ea-a42f-40045488226c'
 
         mock_sd = {
             'outputs': [],