https://github.com/bitcoin/bitcoin/blob/9ad6f14175c19b5d47267c3dd5840c14bad43c83/src/validation.cpp#L3711

If i'm following right the flow of the code, when we hit this lane `pindex` should be always equal to nullptr thus this check may be omitted
{
    CBlockIndex* tip = m_chain.Tip();
    return strprintf("Chainstate [%s] @ height %d (%s)",
        m_from_snapshot_blockhash.IsNull() ? "ibd" : "snapshot",
        tip ? tip->nHeight : -1, tip ? tip->GetBlockHash().ToString() : "null");
}
bool CChainState::ResizeCoinsCaches(size_t coinstip_size, size_t coinsdb_size)