public static BlockBody empty() {
    return EMPTY;
  }
Adding a new field with a corresponding root hash in the block header will require a change in
{@link org.hyperledger.besu.ethereum.eth.manager.task.GetBodiesFromPeerTask.BodyIdentifier}
Also requires adding the new field to the constructor used in the {@link
org.hyperledger.besu.ethereum.util.RawBlockIterator }
ethereum/core/src/main/java/org/hyperledger/besu/ethereum/core/BlockBody.java