rem: if (qx.util.validator.isInvalidString(currentSource)) { 
add: if (qx.util.Validation.isInvalidString(currentSource)) { 
context: proto._applySource = function(){  var currentSource = this.getSource();  if (qx.util.validator.isInvalidString(currentSource)) {    currentSource = qx.manager.object.ImageManager.buildUri("core/blank.gif");  };  this._isLoaded = false;  this.getIframeNode().src = currentSource;};
meta: 1005	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/1005/cfcbb829f6fba5c885606fde737b1ad8b88fe740/QxIframe.js/buggy/qooxdoo/source/script/widgets/QxIframe.js