Only output expected port if it exists

Author: alan412

python_tools/json_util.py

@@ -361,7 +361,9 @@ def _processClass(self, cls):
         constructor_data[_KEY_FUNCTION_DECLARING_CLASS_NAME] = declaring_class_name
         constructor_data[_KEY_FUNCTION_RETURN_TYPE] = declaring_class_name
         # This is where I check to see if
-        constructor_data[_KEY_PORT_EXPECTED_TYPE] = python_util.getPortTypeFromConstructor(value)
+        expectedPortType = python_util.getPortTypeFromConstructor(value)
+        if expectedPortType:
+          constructor_data[_KEY_PORT_EXPECTED_TYPE] = python_util.getPortTypeFromConstructor(value)
 
         constructors.append(constructor_data)
     class_data[_KEY_CONSTRUCTORS] = constructors