add: if (!text) return "";  
context: this.convertToUnicode = function(text, charset){    try    {        var conv = this.CCSV("@mozilla.org/intl/scriptableunicodeconverter", "nsIScriptableUnicodeConverter");        conv.charset = charset ? charset : "UTF-8";        return conv.ConvertToUnicode(text);    }    catch (exc)    {        this.ERROR("lib.convertToUnicode: fails"+exc);        return text;    }};
meta: 7450	/local1/tlutelli/issta_data/temp/all_js/javascript/2007_temp/2007/7450/a693ce585521dd7708142572da02b5a10b9bf206/lib.js/clean/extension/content/firebug/lib.js