More resilient logic in case actions in a procedure return null responses

platypush/message/request/__init__.py

@@ -194,7 +194,8 @@ class Request(Message):
             if self.action.startswith('procedure.'):
                 context['n_tries'] = n_tries
                 response = self._execute_procedure(**context)
-                self._send_response(response)
+                if response is not None:
+                    self._send_response(response)
                 return response
             else:
                 (module_name, method_name) = get_module_and_method_from_action(self.action)

platypush/procedure/__init__.py

@@ -139,7 +139,7 @@ class Procedure(object):
             context['_async'] = self._async; context['n_tries'] = n_tries
             response = request.execute(**context)
 
-            if not self._async:
+            if not self._async and response:
                 if isinstance(response.output, dict):
                     for (k,v) in response.output.items():
                         context[k] = v
@@ -147,7 +147,7 @@ class Procedure(object):
                 context['output'] = response.output
                 context['errors'] = response.errors
 
-        return response
+        return response or Response()
 
 
 class LoopProcedure(Procedure):