message: Skip starting of cache populator thread in case we don't have a valid vvec
diff: @@ -237,18 +237,24 @@ bool CQuorumManager::BuildQuorumFromCommitment(const CFinalCommitment& qc, std::
  quorum->Init(qc.quorumHash, quorumIndex->nHeight, members, qc.validMembers, qc.quorumPublicKey);
  - if (!quorum->ReadContributions(evoDb)) {
  + bool hasValidVvec = false;
  + if (quorum->ReadContributions(evoDb)) {
  + hasValidVvec = true;
  + } else {
  if (BuildQuorumContributions(qc, quorum)) {
  quorum->WriteContributions(evoDb);
  + hasValidVvec = true;
  } else {
  LogPrintf("CQuorumManager::%s -- quorum.ReadContributions and BuildQuorumContributions for block %s failed", __func__, qc.quorumHash.ToString());
  }
  }
  + if (hasValidVvec) {
  // pre-populate caches in the background
  // recovering public key shares is quite expensive and would result in serious lags for the first few signing
  // sessions if the shares would be calculated on-demand
  CQuorum::StartCachePopulatorThread(quorum);
  + }
  return true;
  }
  