rem: if (qx.util.validator.isValidString(f)) 
add: if (qx.util.Validation.isValidString(f)) 
context: proto.error = function(m, f){  if (qx.util.validator.isValidString(f))  {    this.debug(qx.core.Object.DEBUG_FUNCERRORPRE + f + qx.core.Object.DEBUG_FUNCERRORPOST + m, QxConst.EVENT_TYPE_ERROR);  }  else  {    this.debug(m, QxConst.EVENT_TYPE_ERROR);  };};
meta: 1005	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/1005/cfcbb829f6fba5c885606fde737b1ad8b88fe740/QxObject.js/clean/qooxdoo/source/script/core/QxObject.js