message: explictly tell if no transaction is sent in "set contract"
diff: @@ -2446,6 +2446,8 @@ int main( int argc, char** argv ) {
  if (actions.size()) {
  std::cerr << localized("Publishing contract...") << std::endl;
  send_actions(std::move(actions), 10000, packed_transaction::zlib);
  + } else {
  + std::cout << "no transaction is sent" << std::endl;
  }
  });
  codeSubcommand->set_callback(set_code_callback);
  