rem: return this.lineMap[lineNo]; 
add: return this.lineMap ? this.lineMap[lineNo] : false; 
context:     isInExecutableTable: function(lineNo)    {        return this.lineMap[lineNo];    }
meta: 7450	/local1/tlutelli/issta_data/temp/all_js/javascript/2007_temp/2007/7450/657c1059e813834f821277cbe0ed6b432bead8b9/lib.js/buggy/extension/content/firebug/lib.js