code: func NewMsgMerkleBlock(bh *BlockHeader) *MsgMerkleBlock {
  	return &MsgMerkleBlock{
  		Header:       *bh,
  		Transactions: 0,
  		Hashes:       make([]*chainhash.Hash, 0),
  		Flags:        make([]byte, 0),
  	}
  }
docs: // NewMsgMerkleBlock returns a new bitcoin merkleblock message that conforms to
  // the Message interface.  See MsgMerkleBlock for details.