message: [Storage] Small fix for MerkleAccumulatorView::get_consistency_proof
  Since the nodes we are reading are supposed to be frozen and exist in
  storage, we should just use `self.reader.get`, so it would return an
  error if the node doesn't exist.
  Closes:
  Approved by: zamsden
diff: @@ -361,7 +361,7 @@ where
  );
  let subtrees = FrozenSubtreeSiblingIterator::new(sub_acc_leaves, self.num_leaves)
  - .map(|p| self.get_hash(p))
  + .map(|p| self.reader.get(p))
  .collect::<Result<Vec<_>>>()?;
  Ok(AccumulatorConsistencyProof::new(subtrees))
  