marvin_refactor: getText() reveals the actual value

otherwise required is always not None and always True

Signed-off-by: Prasanna Santhanam <tsp@apache.org>

tools/marvin/marvin/codegenerator.py

@@ -311,7 +311,7 @@ class codeGenerator(object):
                 assert paramProperty.name
 
                 required = param.getElementsByTagName('required')
-                if required:
+                if getText(required) == "true":
                     paramProperty.required = getText(required)
 
                 requestDescription = param.getElementsByTagName('description')