rem: if (qx.util.validator.isValidString(propValue)) 
add: if (qx.util.Validation.isValidString(propValue)) 
context: proto._modifyLabel = function(propValue, propOldValue, propData){  this._labelObject.setHtml(propValue);  if (qx.util.validator.isValidString(propValue))  {    this._hasLabel = true;    if (qx.util.validator.isInvalidString(propOldValue)) {      this.addAt(this._labelObject, this.getFirstChild() == this._iconObject ? 1 : 0);    };  }  else  {    this._hasLabel = false;    this.remove(this._labelObject);  };  return true;};
meta: 1005	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/1005/cfcbb829f6fba5c885606fde737b1ad8b88fe740/QxMenuButton.js/clean/qooxdoo/source/script/widgets/QxMenuButton.js