message: Small fix, may fix the forks.
diff: @@ -699,6 +699,9 @@ void CSigmaState::RemoveBlock(CBlockIndex *index) {
  coinGroups.erase(coin.first);
  // decrease pubcoin id for this denomination
  latestCoinIds[coin.first.first]--;
  + if (0 == latestCoinIds[coin.first.first]) {
  + latestCoinIds.erase(coin.first.first);
  + }
  }
  else {
  // roll back lastBlock to previous position
  