[lldb/Reproducers] Account for char** being a nullptr

  }

  void Serialize(const char **t) {

    size_t size = 0;

    if (!t) {

      Serialize(size);

      return;

    }

    // Compute the size of the array.

    const char *const *temp = t;

    size_t size = 0;

    while (*temp++)

      size++;

    Serialize(size);

template <> const char **Deserializer::Deserialize<const char **>() {

  size_t size = Deserialize<size_t>();

  if (size == 0)

    return nullptr;

  const char **r =

      reinterpret_cast<const char **>(calloc(size + 1, sizeof(char *)));

  for (size_t i = 0; i < size; ++i)