add: if (id == "") return; 
context:         function handleRunSelect() {            var id = document.getElementById("qa-st-testrun").selectedItem.getAttribute("value");            litmus.getTestrun(id, populateTestGroups);        }
meta: 10234	/local1/tlutelli/issta_data/temp/all_js/javascript/2007_temp/2007/10234/90ef9304c2721fe74b547056b4a1cfb06120e502/selecttests.js/buggy/testing/extensions/community/chrome/content/tabs/selecttests.js