rem: if (!folder) 
add: if (!folder) 
context: function IsCompactFolderEnabled(){    var folderTree = GetFolderTree();    var selectedFolders = folderTree.selectedItems;    var numFolders = selectedFolders.length;    if (numFolders <= 0 )        return false;    var folder = selectedFolders[0];    if (!folder)         return false;    return (folder.getAttribute('CanCompact') == "true");}
meta: 9421	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/9421/eaa6754a0a946375badf1165b3e4af3999e4b03c/mailWindowOverlay.js/clean/mailnews/base/resources/content/mailWindowOverlay.js