@Override
  public Map<Bytes32, V> entriesFrom(final Function<Node<V>, Map<Bytes32, V>> handler) {
    return new HashMap<>();
  }
A noop {@link MerkleTrie}.

@param <V> The type of values of this trie.
ethereum/trie/src/main/java/org/hyperledger/besu/ethereum/trie/NoOpMerkleTrie.java