Pretty JSON and extended Webuntis Error Handling

lib/app.dart

@@ -90,6 +90,7 @@ class _AppState extends State<App> {
               const Icon(Icons.chat),
               Consumer<ChatListProps>(
                 builder: (context, value, child) {
+                  if(value.primaryLoading()) return const SizedBox.shrink();
                   int messages = value.getRoomsResponse.data.map((e) => e.unreadMessages).reduce((a, b) => a+b);
                   return Visibility(
                     visible: messages > 0,