fixed bugs from merge with master

lib/components/BucketTaskCard.dart

@@ -14,7 +14,7 @@ enum DropLocation {above, below, none}
 
 class TaskData {
   final Task task;
-  final Size size;
+  final Size? size;
   TaskData(this.task, this.size);
 }
 
@@ -214,7 +214,7 @@ class _BucketTaskCardState extends State<BucketTaskCard> with AutomaticKeepAlive
     );
 
     return LongPressDraggable<TaskData>(
-      data: TaskData(widget.task, _cardSize!),
+      data: TaskData(widget.task, _cardSize),
       maxSimultaneousDrags: taskState.taskDragging ? 0 : 1, // only one task can be dragged at a time
       onDragStarted: () {
         taskState.taskDragging = true;

lib/models/list.dart

@@ -5,7 +5,7 @@ import 'package:vikunja_app/models/user.dart';
 class TaskList {
   final int id;
   int namespaceId;
-  final String? title, description;
+  String? title, description;
   final User? owner;
   final DateTime? created, updated;
   List<Task?> tasks;

lib/models/task.dart

@@ -25,7 +25,7 @@ class Task {
   final List<TaskAttachment>? attachments;
   // TODO: add position(?)
 
-  late final CheckboxStatistics _checkboxStatistics;
+  CheckboxStatistics? _checkboxStatistics;
 
   // // TODO: use `late final` once upgraded to current dart version
   Task({

lib/pages/namespace/namespace.dart

@@ -15,7 +15,8 @@ import 'package:vikunja_app/stores/list_store.dart';
 class NamespacePage extends StatefulWidget {
   final Namespace namespace;
 
-  NamespacePage({required this.namespace}) : super(key: Key(namespace.id.toString()));
+  NamespacePage({required this.namespace})
+      : super(key: Key(namespace.id.toString()));
 
   @override
   _NamespacePageState createState() => new _NamespacePageState();
@@ -126,7 +127,13 @@ class _NamespacePageState extends State<NamespacePage>
   _addList(String name, BuildContext context) {
     VikunjaGlobal.of(context)
         .listService
-        .create(widget.namespace.id, TaskList(id: 0, title: name, tasks: []))
+        .create(
+            widget.namespace.id,
+            TaskList(
+                id: 0,
+                title: name,
+                tasks: [],
+                namespaceId: widget.namespace.id))
         .then((_) {
       setState(() {});
       _loadLists();

lib/service/mocked_services.dart

@@ -33,7 +33,8 @@ var _lists = {
       owner: _users[1],
       description: 'A nice list',
       created: DateTime.now(),
-      updated: DateTime.now())
+      updated: DateTime.now(),
+      namespaceId: 1)
 };
 
 var _tasks = {