code: protected static boolean isMissingUserDefaultMessages(ModuleConfig mc)
      {
          if (mc != null) {
              ControllerConfig cc = mc.getControllerConfig();
  
              if (cc instanceof PageFlowControllerConfig) {
                  return ((PageFlowControllerConfig) cc).isMissingDefaultMessages();
              }
          }
  
          return false;
      }
docs: Tell whether the given Struts module has no default message bundle defined.
  @return <code>true</code> if the given Struts module has no user-specified default message bundle.