Display: Fix app notifier when there are no notifications from legacy

assets/vue/App.vue

@@ -143,6 +143,7 @@ onUpdated(() => {
 
   const flashes = JSON.parse(app.dataset.flashes)
 
+  if (!Array.isArray(flashes)) {
     for (const key in flashes) {
       const notificationType = key === 'danger' ? 'Error' : capitalize(key);
 
@@ -150,6 +151,7 @@ onUpdated(() => {
         notification[`show${notificationType}Notification`](flashText);
       }
     }
+  }
 
   app.dataset.flashes = "";
 })