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">


import static org.apache.dubbo.registry.Constants.CONFIGURATORS_SUFFIX;
import static org.apache.dubbo.registry.Constants.DEFAULT_REGISTRY_RETRY_PERIOD;
import static org.apache.dubbo.registry.Constants.ENABLE_CONFIGURATION_LISTEN;
import static org.apache.dubbo.registry.Constants.PROVIDER_PROTOCOL;
import static org.apache.dubbo.registry.Constants.REGISTER_IP_KEY;
import static org.apache.dubbo.registry.Constants.REGISTER_KEY;
import static org.apache.dubbo.registry.Constants.REGISTRY_RETRY_PERIOD_KEY;
import static org.apache.dubbo.registry.Constants.SIMPLIFIED_KEY;
import static org.apache.dubbo.remoting.Constants.BIND_IP_KEY;
import static org.apache.dubbo.remoting.Constants.BIND_PORT_KEY;
import static org.apache.dubbo.remoting.Constants.CHECK_KEY;
import static org.apache.dubbo.remoting.Constants.CODEC_KEY;
import static org.apache.dubbo.remoting.Constants.CONNECTIONS_KEY;
import static org.apache.dubbo.remoting.Constants.EXCHANGER_KEY;
import static org.apache.dubbo.remoting.Constants.SERIALIZATION_KEY;
import static org.apache.dubbo.rpc.Constants.DEPRECATED_KEY;
import static org.apache.dubbo.rpc.Constants.GENERIC_KEY;
import static org.apache.dubbo.rpc.Constants.INTERFACES;
import static org.apache.dubbo.rpc.Constants.MOCK_KEY;
import static org.apache.dubbo.rpc.Constants.TOKEN_KEY;
import static org.apache.dubbo.rpc.cluster.Constants.CONSUMER_URL_KEY;
import static org.apache.dubbo.rpc.cluster.Constants.EXPORT_KEY;
import static org.apache.dubbo.rpc.cluster.Constants.REFER_KEY;
import static org.apache.dubbo.rpc.cluster.Constants.WARMUP_KEY;
import static org.apache.dubbo.rpc.cluster.Constants.WEIGHT_KEY;
import static org.apache.dubbo.rpc.model.ScopeModelUtil.getApplicationModel;
/**
 * TODO, replace RegistryProtocol completely in the future.
 */
public class RegistryProtocol implements Protocol, ScopeModelAware {