message: leave a comment not to try to remove an account
diff: @@ -209,7 +209,8 @@ impl DelegationState {
  output = CertificateApplyOutput::CreateAccount(reg.stake_key_id.clone());
  }
  CertificateContent::StakeKeyDeregistration(ref reg) => {
  - new_state = new_state.deregister_stake_key(&reg.stake_key_id)?
  + new_state = new_state.deregister_stake_key(&reg.stake_key_id)?;
  + // don't delete account
  }
  CertificateContent::StakePoolRegistration(ref reg) => {
  new_state = new_state.register_stake_pool(reg.clone())?
  