Basic Webuntis error handling

lib/data/dataHolder.dart

@@ -1,3 +1,5 @@
+import 'dart:developer';
+
 import 'package:flutter/cupertino.dart';
 import 'package:localstore/localstore.dart';
 
@@ -13,6 +15,12 @@ abstract class DataHolder extends ChangeNotifier {
   List<ApiResponse?> properties();
 
   bool primaryLoading() {
-    return properties().where((element) => element != null).isEmpty;
+    log(properties().toString());
+
+    for(ApiResponse? element in properties()) {
+      if(element == null) return true;
+    }
+    return false;
+    //return properties().where((element) => element != null).isEmpty;
   }
 }