message: fix(account-lib): check accountId for null before accessing property
  Types package must have had a breaking change here, so let's check to
  make sure this property exists before using it.
  Ticket:
diff: @@ -39,6 +39,9 @@ export function isValidTransactionId(txId: string): boolean {
  }
  try {
  const tx = TransactionId.fromString(txId);
  + if (_.isNil(tx.accountId)) {
  + return false;
  + }
  return !_.isNaN(tx.accountId.num);
  } catch (e) {
  return false;
  