refactored timetable

lib/api/webuntis/queries/getHolidays/getHolidaysCache.dart

@@ -5,7 +5,16 @@ import 'getHolidays.dart';
 import 'getHolidaysResponse.dart';
 
 class GetHolidaysCache extends RequestCache<GetHolidaysResponse> {
-  GetHolidaysCache({void Function(GetHolidaysResponse)? onUpdate}) : super(RequestCache.cacheDay, onUpdate) {
+  GetHolidaysCache({
+    void Function(GetHolidaysResponse)? onUpdate,
+    void Function(Exception)? onError,
+    bool? renew,
+  }) : super(
+          RequestCache.cacheDay,
+          onUpdate,
+          onError: onError ?? RequestCache.ignore,
+          renew: renew,
+        ) {
     start('wu-holidays');
   }