rem: if (!treechildren) return; 
add: if (!listbox) return; 
context: function fillSmtpServers(treechildren, servers, defaultServer){    if (!treechildren) return;    if (!servers) return;    var serverCount = servers.Count();    for (var i=0 ; i<serverCount; i++) {        var server = servers.QueryElementAt(i, Components.interfaces.nsISmtpServer);        var isDefault = (defaultServer.key == server.key);        //ToDoList: add code that allows for the redirector type to specify whether to show values or not        if (!server.redirectorType)         {          var treeitem = createSmtpTreeItem(server, isDefault);          treechildren.appendChild(treeitem);        }    }}
meta: 5872	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/5872/d38a0937d9c93a0a9d913e2ac781e4328bb8cc73/SmtpServerList.js/buggy/mailnews/base/prefs/resources/content/SmtpServerList.js