Ignore another dead_code hint for a weak-only null check. (#63602)

packages/flutter/lib/src/painting/image_provider.dart

@@ -672,7 +672,10 @@ abstract class AssetBundleImageProvider extends ImageProvider<AssetBundleImageKe
       PaintingBinding.instance!.imageCache!.evict(key);
       rethrow;
     }
-    if (data == null) {
+    // `key.bundle.load` has a non-nullable return type, but might be null when
+    // running with weak checking, so we need to null check it anyway (and
+    // ignore the warning that the null-handling logic is dead code).
+    if (data == null) { // ignore: dead_code
       PaintingBinding.instance!.imageCache!.evict(key);
       throw StateError('Unable to read data');
     }