Revert "opt: non null (#1091)"

This reverts commit 3c34e43827.

lib/common/widgets/dialog/dialog.dart

@@ -4,7 +4,7 @@ import 'package:get/get.dart';
 void showConfirmDialog({
   required BuildContext context,
   required String title,
-  Object? content,
+  dynamic content,
   required VoidCallback onConfirm,
 }) {
   showDialog(

lib/common/widgets/image/image_save.dart

@@ -10,7 +10,7 @@ import 'package:get/get.dart';
 void imageSaveDialog({
   required String? title,
   required String? cover,
-  Object? aid,
+  dynamic aid,
   String? bvid,
 }) {
   final double imgWidth = Get.mediaQuery.size.shortestSide - 8 * 2;

lib/common/widgets/image/nine_grid_view.dart

@@ -506,7 +506,7 @@ class _ImageUtil {
           );
         }
       },
-      onError: (exception, stackTrace) {
+      onError: (dynamic exception, StackTrace? stackTrace) {
         imageStream.removeListener(listener);
         if (!completer.isCompleted) {
           completer.completeError(exception, stackTrace);

lib/common/widgets/loading_widget/loading_widget.dart

@@ -6,17 +6,13 @@ Widget get loadingWidget => const Center(child: CircularProgressIndicator());
 Widget get linearLoading =>
     const SliverToBoxAdapter(child: LinearProgressIndicator());
 
-Widget errorWidget({String? errMsg, VoidCallback? onReload}) => HttpError(
+Widget errorWidget({errMsg, onReload}) => HttpError(
   isSliver: false,
   errMsg: errMsg,
   onReload: onReload,
 );
 
-Widget scrollErrorWidget({
-  String? errMsg,
-  VoidCallback? onReload,
-  ScrollController? controller,
-}) => CustomScrollView(
+Widget scrollErrorWidget({errMsg, onReload, controller}) => CustomScrollView(
   controller: controller,
   slivers: [
     HttpError(