rem: for (line in this.lineMap) str += "["+line+"]="+this.lineMap[line]; 
add: if (this.lineMap) for (line in this.lineMap) str += "["+line+"]="+this.lineMap[line]; else str += '(not built)'; 
context:     dumpLineMap: function()    {        var str = "SourceFile " + this.href+"; lineMap: ";        for (line in this.lineMap) str += "["+line+"]="+this.lineMap[line];        return str;    },
meta: 7450	/local1/tlutelli/issta_data/temp/all_js/javascript/2007_temp/2007/7450/657c1059e813834f821277cbe0ed6b432bead8b9/lib.js/buggy/extension/content/firebug/lib.js