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">


registry.register(registeredProviderUrl);
    }
    private void registerStatedUrl(URL registryUrl, URL registeredProviderUrl, boolean registered) {
        ProviderModel model = (ProviderModel) registeredProviderUrl.getServiceModel();
        model.addStatedUrl(new ProviderModel.RegisterStatedURL(
            registeredProviderUrl,
            registryUrl,
            registered));
    }
    @Override
    public <T> Exporter<T> export(final Invoker<T> originInvoker) throws RpcException {
        URL registryUrl = getRegistryUrl(originInvoker);
        
        URL providerUrl = getProviderUrl(originInvoker);
        
        
        
        
        final URL overrideSubscribeUrl = getSubscribedOverrideUrl(providerUrl);
        final OverrideListener overrideSubscribeListener = new OverrideListener(overrideSubscribeUrl, originInvoker);
        Map<URL, NotifyListener> overrideListeners = getProviderConfigurationListener(providerUrl).getOverrideListeners();
        overrideListeners.put(registryUrl, overrideSubscribeListener);
        providerUrl = overrideUrlWithConfig(providerUrl, overrideSubscribeListener);
        
        final ExporterChangeableWrapper<T> exporter = doLocalExport(originInvoker, providerUrl);
        
        final Registry registry = getRegistry(registryUrl);
        final URL registeredProviderUrl = getUrlToRegistry(providerUrl, registryUrl);
        
        boolean register = providerUrl.getParameter(REGISTER_KEY, true) && registryUrl.getParameter(REGISTER_KEY, true);