Implemented basic Fileviewing

lib/data/timetable/timetableProps.dart

@@ -1,6 +1,4 @@
 
-import 'dart:developer';
-
 import 'package:intl/intl.dart';
 import 'package:marianum_mobile/api/apiResponse.dart';
 import 'package:marianum_mobile/api/webuntis/queries/getHolidays/getHolidaysCache.dart';
@@ -31,7 +29,7 @@ class TimetableProps extends DataHolder {
   late DateTime endDate = getDate(_queryWeek.add(Duration(days: DateTime.daysPerWeek - _queryWeek.weekday)));
 
   GetTimetableResponse? _getTimetableResponse;
-  GetTimetableResponse get getTimetableResponse => _getTimetableResponse!;
+  GetTimetableResponse get getTimetableResponse => _getTimetableResponse!; //TODO failed null check when no cache
 
   GetRoomsResponse? _getRoomsResponse;
   GetRoomsResponse get getRoomsResponse => _getRoomsResponse!;