add: else ClearCardViewPane(); 
context: function UpdateCardView(){	var tree = document.getElementById('resultsTree');	if ( tree && tree.selectedItems && (tree.selectedItems.length == 1) )		DisplayCardViewPane(tree.selectedItems[0]);}
meta: 9421	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/9421/a5d1a0713b440046f959f7a40cb424e47b33989a/addressbook.js/buggy/mailnews/addrbook/resources/content/addressbook.js