message: use default()
diff: @@ -5,8 +5,6 @@ use domain::ledger::constants;
  use errors::prelude::*;
  use services::ledger::merkletree::merkletree::MerkleTree;
  use services::pool::{PoolService, types:: *};
  -use services::ledger::merkletree::tree::Tree;
  -use utils::crypto::hash::EMPTY_HASH_BYTES;
  pub const REQUESTS_FOR_STATE_PROOFS: [&str; 10] = [
  constants::GET_NYM,
  @@ -206,12 +204,7 @@ impl Into<Option<RequestEvent>> for PoolEvent {
  match parsed {
  //TODO change mapping for CatchupReq. May be return None
  Message::CatchupReq(_) => RequestEvent::CatchupReq(
  - MerkleTree {
  - root: Tree::empty(EMPTY_HASH_BYTES.to_vec()),
  - height: 0,
  - count: 0,
  - nodes_count: 0
  - }, 0, vec![]),
  + MerkleTree::default(), 0, vec![]),
  Message::CatchupRep(rep) => RequestEvent::CatchupRep(rep, node_alias),
  Message::LedgerStatus(ls) => RequestEvent::LedgerStatus(ls, Some(node_alias), None),
  Message::ConsistencyProof(cp) => RequestEvent::ConsistencyProof(cp, node_alias),
  