message: Remove serial checking
diff: @@ -165,13 +165,6 @@ int TxProcessor::ProcessSimpleSpend(const CMPTransaction& tx)
  assert(spend);
  assert(serial);
  - if (IsFeatureActivated(FEATURE_SIGMA_SPENDV1, block)) {
  - if (!serial->isMember() || serial->isZero()) {
  - PrintToLog("%s() : Serial is invalid\n", __func__);
  - return PKT_ERROR_SIGMA - 907;
  - }
  - }
  -
  CBitcoinAddress receiver(tx.getReceiver());
  if (!receiver.IsValid()) {
  PrintToLog("%s(): rejected: receiver address is invalid\n", __func__);
  