code: function _getTargetNode(d, property) {
    if(d.get('target.type') === DataProcessor.types.OUTPUT && d.get('source.' + property)) {
      return d.source;
    }
    if(d.get('target.' + property)) {
      return d.target;
    }
  }
docs: Get the node from/to which the link must transition on enter/exit
  @param d {DataNode}
  @param property {String} Property to be checked for
  @return node