message: Filter empty config file paths
diff: @@ -356,6 +356,8 @@ error actor_system_config::parse(string_list args) {
  } else {
  // Try config_file_path and if that fails try the alternative paths.
  auto try_open = [this, &conf](const auto& what) {
  + if (what.empty())
  + return false;
  conf.open(what);
  if (conf.is_open()) {
  set("global.config-file", what);
  