message: spectest: fix skip() in action
diff: @@ -141,7 +141,10 @@ public:
  const auto& action = cmd.at("action");
  const auto action_type = action.at("type").get<std::string>();
  if (action_type != "invoke")
  + {
  skip("Unsupported action type '" + action_type + "'");
  + continue;
  + }
  auto result = invoke(action);
  if (!result.has_value())
  