LibWeb: Make factory method of FileAPI::Blob fallible

Author: https://github.com/kennethmyhra
Commit: 15917146d3
Pull-request: https://github.com/SerenityOS/serenity/pull/17491
Reviewed-by: https://github.com/linusg ✅

Userland/Libraries/LibWeb/Fetch/Body.cpp

@@ -109,7 +109,7 @@ WebIDL::ExceptionOr<JS::Value> package_data(JS::Realm& realm, ByteBuffer bytes,
         // Return a Blob whose contents are bytes and type attribute is mimeType.
         // NOTE: If extracting the mime type returns failure, other browsers set it to an empty string - not sure if that's spec'd.
         auto mime_type_string = mime_type.has_value() ? mime_type->serialized() : DeprecatedString::empty();
-        return FileAPI::Blob::create(realm, move(bytes), move(mime_type_string));
+        return TRY(FileAPI::Blob::create(realm, move(bytes), move(mime_type_string)));
     }
     case PackageDataType::FormData:
         // If mimeType’s essence is "multipart/form-data", then: