@Override
  public Proof<V> getValueWithProof(final K key) {
    return new Proof<>(Optional.empty(), new ArrayList<>());
  }
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