fixed error messages in album views

Author: ReightI

lib/views/album/album_view_page.dart

@@ -176,6 +176,15 @@ class _AlbumViewPageState extends State<AlbumViewPage> {
                   future: _data,
                   builder: (context, snapshot) {
                     if (snapshot.hasData) {
+                      if (snapshot.data!.first.hasError && snapshot.data!.last.hasError) {
+                        return Padding(
+                          padding: const EdgeInsets.symmetric(horizontal: 16.0, vertical: 8.0),
+                          child: Text(
+                            appStrings.categoryImageList_noDataError,
+                            textAlign: TextAlign.center,
+                          ),
+                        );
+                      }
                       return Column(
                         crossAxisAlignment: CrossAxisAlignment.center,
                         children: [
@@ -410,11 +419,6 @@ class _AlbumViewPageState extends State<AlbumViewPage> {
   Widget _imageGrid(AsyncSnapshot snapshot) {
     if (_imageList.isEmpty && _page == 0) {
       final ApiResult<List<ImageModel>> result = snapshot.data!.last as ApiResult<List<ImageModel>>;
-      if (result.hasError || !result.hasData) {
-        return Center(
-          child: Text(appStrings.categoryImageList_noDataError),
-        );
-      }
       _imageList = result.data!;
       WidgetsBinding.instance.addPostFrameCallback((timeStamp) => setState(() {}));
     }

lib/views/album/root_album_view_page.dart

@@ -71,6 +71,7 @@ class _RootAlbumViewPageState extends State<RootAlbumViewPage> {
         child: SafeArea(
           child: CustomScrollView(
             controller: _scrollController,
+            physics: const AlwaysScrollableScrollPhysics(),
             slivers: [
               RootSearchAppBar(
                 scrollController: _scrollController,
@@ -96,14 +97,22 @@ class _RootAlbumViewPageState extends State<RootAlbumViewPage> {
         if (snapshot.hasData) {
           ApiResult<List<AlbumModel>> result = snapshot.data!;
           if (!result.hasData) {
-            return Center(
-              child: Text(appStrings.categoryImageList_noDataError),
+            return Padding(
+              padding: const EdgeInsets.symmetric(horizontal: 16.0, vertical: 8.0),
+              child: Text(
+                appStrings.categoryImageList_noDataError,
+                textAlign: TextAlign.center,
+              ),
             );
           }
           if (_albumList.isEmpty) {
             if (result.data!.isEmpty) {
-              return Center(
-                child: Text(appStrings.categoryMainEmpty),
+              return Padding(
+                padding: const EdgeInsets.symmetric(horizontal: 16.0, vertical: 8.0),
+                child: Text(
+                  appStrings.categoryMainEmpty,
+                  textAlign: TextAlign.center,
+                ),
               );
             }
             _albumList = result.data!;