[Improvement] Posssible NPE in ModelVersionUpdatesRequest.java

[justinmclean]

What would you like to be improved?

In common/src/main/java/org/apache/gravitino/dto/requests/ModelVersionUpdatesRequest.java a null pointer exception will happen if update is null when validate() is call.

How should we improve?

Check if it is null and throw an IllegalArgumentException

[joonseolee]

Can I take this issue?

[justinmclean]

Yes you can. If you need help, just ask.