fix(images): validate image availability before fading-in

[skip ci]

Author: jagandeepbrar

lib/modules/nzbget/routes/queue.dart

@@ -58,7 +58,9 @@ class _State extends State<NZBGetQueue>
       });
 
   Future<void> _fetchWithoutMessage() async {
-    _fetch().then((_) => {if (mounted) setState(() {})}).catchError((error) {
+    _fetch().then((_) {
+      if (mounted) setState(() {});
+    }).catchError((error) {
       _queue = null;
     });
   }
@@ -76,7 +78,7 @@ class _State extends State<NZBGetQueue>
     }).catchError((error) {
       _queue = null;
       _setError(true);
-      return Future.error(error);
+      throw error;
     });
   }
 

lib/widgets/ui/block/block.dart

@@ -164,6 +164,8 @@ class LunaBlock extends StatelessWidget {
   }
 
   Widget _fadeInBackground(BuildContext context, double _height) {
+    if (backgroundUrl == null) return const SizedBox();
+
     final _percent = LunaSeaDatabase.THEME_IMAGE_BACKGROUND_OPACITY.read();
     if (_percent == 0) return const SizedBox(height: 0, width: 0);
 

lib/widgets/ui/block/grid_block.dart

@@ -85,6 +85,8 @@ class LunaGridBlock extends StatelessWidget {
   }
 
   Widget _fadeInBackground(BuildContext context) {
+    if (backgroundUrl == null) return const SizedBox();
+
     final _percent = LunaSeaDatabase.THEME_IMAGE_BACKGROUND_OPACITY.read();
     if (_percent == 0) return const SizedBox(height: 0, width: 0);