message: Fixed to require (and report) subcommands for voteproducer. GH
diff: @@ -1717,7 +1717,7 @@ int main( int argc, char** argv ) {
  auto unregisterProducer = unregister_producer_subcommand(system);
  auto voteProducer = system->add_subcommand("voteproducer", localized("Vote for a producer"));
  - system->require_subcommand();
  + voteProducer->require_subcommand();
  auto voteProxy = vote_producer_proxy_subcommand(voteProducer);
  auto voteProducers = vote_producers_subcommand(voteProducer);
  