Dubbo Version: 3.0.10
注册失败，unexport时，subscribeUrl和registerUrl此时为空，需要判断空处理。 
<img width="944" alt="image" src="https://user-images.githubusercontent.com/12670328/200469537-41a4ccb5-adda-4231-9f71-9af9fec2172d.png">


public static final String[] DEFAULT_REGISTER_PROVIDER_KEYS = {
        APPLICATION_KEY, CODEC_KEY, EXCHANGER_KEY, SERIALIZATION_KEY, CLUSTER_KEY, CONNECTIONS_KEY, DEPRECATED_KEY,
        GROUP_KEY, LOADBALANCE_KEY, MOCK_KEY, PATH_KEY, TIMEOUT_KEY, TOKEN_KEY, VERSION_KEY, WARMUP_KEY,
        WEIGHT_KEY, DUBBO_VERSION_KEY, RELEASE_KEY, SIDE_KEY, IPV6_KEY
    };
    public static final String[] DEFAULT_REGISTER_CONSUMER_KEYS = {
        APPLICATION_KEY, VERSION_KEY, GROUP_KEY, DUBBO_VERSION_KEY, RELEASE_KEY
    };
    private static final ErrorTypeAwareLogger logger = LoggerFactory.getErrorTypeAwareLogger(RegistryProtocol.class);
    private final Map<String, ServiceConfigurationListener> serviceConfigurationListeners = new ConcurrentHashMap<>();
    
    
    private final ConcurrentMap<String, ExporterChangeableWrapper<?>> bounds = new ConcurrentHashMap<>();
    protected Protocol protocol;
    protected ProxyFactory proxyFactory;
    private ConcurrentMap<URL, ReExportTask> reExportFailedTasks = new ConcurrentHashMap<>();
    private HashedWheelTimer retryTimer = new HashedWheelTimer(new NamedThreadFactory("DubboReexportTimer", true), DEFAULT_REGISTRY_RETRY_PERIOD, TimeUnit.MILLISECONDS, 128);
    private FrameworkModel frameworkModel;
    
    private static String[] getFilteredKeys(URL url) {
        Map<String, String> params = url.getParameters();
        if (CollectionUtils.isNotEmptyMap(params)) {
            return params.keySet().stream()
                .filter(k -> k.startsWith(HIDE_KEY_PREFIX))
                .toArray(String[]::new);
        } else {
            return new String[0];
        }