When removing an empty res also remove refs to it in depends_on

Change-Id: I4cad4f29d0f9153eb966370089663b419a53dfaf

translator/hot/translate_node_templates.py

@@ -390,6 +390,11 @@ class TranslateNodeTemplates(object):
         for resource in to_remove:
             self.hot_resources.remove(resource)
 
+        for resource in self.hot_resources:
+            for removed_resource in to_remove:
+                if removed_resource in resource.depends_on:
+                    resource.depends_on.remove(removed_resource)
+
         return self.hot_resources
 
     def translate_param_value(self, param_value, resource):

translator/tests/data/hot_output/hot_get_functions_semantic.yaml

@@ -16,8 +16,6 @@ resources:
         get_resource: myapp_configure_config
       server:
         get_resource: server
-    depends_on:
-    - mysql_database
   server:
     type: OS::Nova::Server
     properties: