https://travis-ci.org/github/bitcoin/bitcoin/jobs/679885530#L8791
{
    if (nIndex != -1) {
        m_spk_man->KeepDestination(nIndex, type);
    }
    nIndex = -1;
    address = CNoDestination();
}
void ReserveDestination::ReturnDestination()
{
    if (nIndex != -1) {
        m_spk_man->ReturnDestination(nIndex, fInternal, address);
    }
    nIndex = -1;
    address = CNoDestination();
}
#ifdef ENABLE_EXTERNAL_SIGNER
ExternalSigner CWallet::GetExternalSigner()