add: if (!uri) return null; 
context: function GetServer(uri){	try {		var folder = GetMsgFolderFromUri(uri);		return folder.server;	}	catch (ex) {		dump("GetServer("+uri+") failed, ex="+ex+"\n");	}	return null;}
meta: 9421	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/9421/6c45e79b60c1378571c205a8bee7e5a5d356f7b6/msgMail3PaneWindow.js/buggy/mailnews/base/resources/content/msgMail3PaneWindow.js