[C++] can't insert null value in vector

[boyism80]

it's same issue (#7846) but not fixed in c++

table nullable_uint {
  value: uint;
}

table ping {
  id_list: [nullable_uint];
}

auto CreateId(flatbuffers::FlatBufferBuilder& builder) const
{
    auto result = std::vector<flatbuffers::Offset<nullable_uint>>();
    for (auto& x : this->id)
    {
        if (x.has_value())
        {
            auto nullable_builder = nullable_uintBuilder(builder);
            nullable_builder.add_value(x.value());
            result.push_back(nullable_builder.Finish());
        }
        else
        {
            result.push_back(0);
        }
    }

    return builder.CreateVector(result);
}

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