player/js/elements/NullElement.js

function NullElement(data, globalData, comp) {
  this.initFrame();
  this.initBaseData(data, globalData, comp);
  this.initFrame();
  this.initTransform(data, globalData, comp);
  this.initHierarchy();
}

NullElement.prototype.prepareFrame = function (num) {
  this.prepareProperties(num, true);
};

NullElement.prototype.renderFrame = function () {
};

NullElement.prototype.getBaseElement = function () {
  return null;
};

NullElement.prototype.destroy = function () {
};

NullElement.prototype.sourceRectAtTime = function () {
};

NullElement.prototype.hide = function () {
};

extendPrototype([BaseElement, TransformElement, HierarchyElement, FrameElement], NullElement);