fix(neon_dashboard): Fix empty widget item icon urls

Signed-off-by: jld3103 <jld3103yt@gmail.com>

packages/neon/neon_dashboard/lib/src/widgets/widget_item.dart

@@ -25,9 +25,14 @@ class DashboardWidgetItem extends StatelessWidget {
       dimension: largeIconSize,
       child: NeonImageWrapper(
         borderRadius: roundIcon ? BorderRadius.circular(largeIconSize) : null,
-        child: NeonUrlImage(
+        child: item.iconUrl.isNotEmpty
+            ? NeonUrlImage(
                 url: item.iconUrl,
                 size: const Size.square(largeIconSize),
+              )
+            : Icon(
+                Icons.question_mark,
+                color: Theme.of(context).colorScheme.error,
               ),
       ),
     );