Remove irrelevant check

Author: Hind-M

tests/test_serialize_null_array.cpp

@@ -49,9 +49,6 @@ namespace sparrow_ipc
         CHECK_EQ(deserialized_arr.name().value(), arr.name().value());
 
         REQUIRE(deserialized_arr.metadata().has_value());
-        const auto& deserialized_metadata = deserialized_arr.metadata().value();
-        REQUIRE_EQ(deserialized_metadata.size(), arr.metadata().value().size());
-
         compare_metadata(arr, deserialized_arr);
 
         // Check the deserialized object is a null_array