Function getOptionalString

fdbserver/workloads/ConsistencyCheck.actor.cpp:2082–2086

	template <class T>
	static std::string getOptionalString(Optional<T> opt) {
		if (opt.present())
			return opt.get().toString();
		return "NotSet";
	}

	ACTOR Future<bool> checkCoordinators(Database cx) {
		state Transaction tr(cx);