dubbo3.0.6之后当服务内没有需要暴露的dubbo服务，nacos就没法注册上去

org.apache.dubbo dubbo-spring-boot-starter 3.0.8

<!-- dubbo-registry-nacos -->
<dependency>
    <groupId>org.apache.dubbo</groupId>
    <artifactId>dubbo-registry-nacos</artifactId>
    <version>3.0.8</version>
    <exclusions>
        <exclusion>
            <groupId>log4j</groupId>
            <artifactId>log4j</artifactId>
        </exclusion>
        <exclusion>
            <groupId>org.apache.dubbo</groupId>
            <artifactId>dubbo-common</artifactId>
        </exclusion>
        <exclusion>
            <groupId>org.apache.dubbo</groupId>
            <artifactId>dubbo-remoting-api</artifactId>
        </exclusion>
    </exclusions>
</dependency>`

用3.0.6的版本空服务也能够注册到nacos去，用3.0.6以后的版本必须要有service暴露在dubbo才能够nacos注册成功

原提问者GitHub用户a937282042