add: if (id == "") return; 
context:         function handleRunSelect() {            var id = document.getElementById("qa-st-testrun").selectedItem.getAttribute("value");            litmus.getTestrun(id, populateTestGroups);        }
meta: 9421	/local1/tlutelli/issta_data/temp/all_js/javascript/2007_temp/2007/9421/9da29acb8b8aa6a928459923eac8d1a57597771c/selecttests.js/clean/testing/extensions/community/chrome/content/tabs/selecttests.js