* [x] I have searched the [issues](https://github.com/apache/dubbo/issues) of this repository and believe that this is not a duplicate. * [x] I have checked the [FAQ](https://github.com/apache/dubbo/blob/master/FAQ.md) of this repository and believe that this is not a duplicate. ### Environment * Dubbo version: 2.7.6-snapshot files: https://github.com/apache/dubbo/blob/a9a69eac67ded8663fb96e940f07eacc8c0f72b5/dubbo-config/dubbo-config-api/src/main/java/org/apache/dubbo/config/ServiceConfig.java#L359 https://github.com/apache/dubbo/blob/a9a69eac67ded8663fb96e940f07eacc8c0f72b5/dubbo-config/dubbo-config-api/src/main/java/org/apache/dubbo/config/ServiceConfig.java#L631 This check is useless, always is non-null.