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);