code: public static ModelNode getResults(ModelNode operationResult) {
          if (!operationResult.hasDefined(RESULT)) {
              return new ModelNode();
          }
  
          return operationResult.get(RESULT);
      }
docs: If the given node has results, those results are returned in a ModelNode.
  Otherwise, an empty node is returned.
  
  @param operationResult the node to examine
  @return the results as a ModelNode