UX: Redirect to the login page if trying to view assigned topics as anon (#133)

assets/javascripts/discourse-assign/routes/user-activity-assigned.js.es6

@@ -1,10 +1,18 @@
 import I18n from "I18n";
 import UserTopicListRoute from "discourse/routes/user-topic-list";
+import cookie from "discourse/lib/cookie";
 
 export default UserTopicListRoute.extend({
   userActionType: 16,
   noContentHelpKey: "discourse_assigns.no_assigns",
 
+  beforeModel() {
+    if (this.currentUser === undefined) {
+      cookie("destination_url", window.location.href);
+      this.transitionTo("login");
+    }
+  },
+
   model(params) {
     return this.store.findFiltered("topicList", {
       filter: `topics/messages-assigned/${this.modelFor("user").get(