fixed issue with data.url being undefined if ajaxification is canceled

lib/persona.js

@@ -25,9 +25,9 @@ $(document).ready(function() {
 			NProgress.done();
 			setupHoverCards();
 
-			if (data.url.match('user/')) {
+			if (data.url && data.url.match('user/')) {
 				setupFavouriteButtonOnProfile();
-			} else if (data.url.match('^chats')) {
+			} else if (data.url && data.url.match('^chats')) {
 				require(['persona/chats'], function(chats) {
 					chats.init();
 				});