Misc login form improvements

app/assets/app/service/Message.service.js

@@ -1,4 +1,5 @@
 import { event_bus } from './EventBus.service.js'
+import { auth_api } from './AuthApi.service.js'
 
 class MessageService {
     listener_interval = 25000
@@ -20,14 +21,16 @@ class MessageService {
         return axios.post(`/api/v1/message/banners/read/${banner_id}`)
     }
 
-    init_listener() {
-        this.message_ids = []
-        this.listener = setInterval(() => this._listener_tick(), this.listener_interval)
-        window.addEventListener('beforeunload', () => this.stop_listener())
-        try {
-            this._listener_tick()
-        } catch (e) {
-            this.stop_listener()
+    async init_listener() {
+        if ( await auth_api.get_authenticated_user() ) {
+            this.message_ids = []
+            this.listener = setInterval(() => this._listener_tick(), this.listener_interval)
+            window.addEventListener('beforeunload', () => this.stop_listener())
+            try {
+                this._listener_tick()
+            } catch (e) {
+                this.stop_listener()
+            }
         }
     }