message: Return empty array if no transaction is found in ethereum searcher
diff: @@ -39,8 +39,8 @@ class TransactionSearcher {
  get(i, 'type') === 'ethereum-transactions')) {
  return await this._queryTransactions(query);
  } else if (get(query, 'filter.id.exact') && get(query, 'filter.type.exact') === 'ethereum-transactions') {
  - let transaction = await this._getTransaction(query.filter.id.exact);
  - return { data: [transaction.data] };
  + let { data: transaction } = await this._getTransaction(query.filter.id.exact) || {};
  + return { data: transaction ? [ transaction ] : [] };
  }
  return next();
  }
  