[GitHub] [incubator-eventmesh] Alonexc opened a new issue, #3505: [Enhancement] Enhancement title

Wed, 22 Mar 2023 00:56:33 -0700 


Alonexc opened a new issue, #3505:
URL: https://github.com/apache/incubator-eventmesh/issues/3505

   ### Search before asking
   
   - [X] I had searched in the 
[issues](https://github.com/apache/eventmesh/issues?q=is%3Aissue) and found no 
similar issues.
   
   
   ### Enhancement Request
   
   
![image](https://user-images.githubusercontent.com/91315508/226833758-3f11c826-671c-401b-bd3d-e2bc417ec951.png)
   
![image](https://user-images.githubusercontent.com/91315508/226833770-a01a6015-8060-4a34-9a43-5a6a4bd4af0d.png)
   
![image](https://user-images.githubusercontent.com/91315508/226833780-3f337746-b245-495c-9fe3-6a02142ef354.png)
   located at:
   
eventmesh-registry-plugin/eventmesh-registry-etcd/src/main/java/org/apache/eventmesh/registry/etcd/service/EtcdRegistryService.java
 line 185,274,207
   
   
   ### Describe the solution you'd like
   
   a. return an empty map/collection instead of null.
   
![image](https://user-images.githubusercontent.com/91315508/226834102-198d1c59-a463-478d-804c-270abec2a4d5.png)
   
![image](https://user-images.githubusercontent.com/91315508/226834112-762ff58c-0344-413b-b6e1-753a662f25a8.png)
   
   b. use Objects.requireNonNull().
   
![image](https://user-images.githubusercontent.com/91315508/226834151-91fadcc3-2c09-42a1-a50b-007e30e39e4d.png)
   
   ### Are you willing to submit PR?
   
   - [ ] Yes I am willing to submit a PR!


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