fix: msg不允许为空

wl

2022-12-23 b680856aa7a5c7225fae1ea81f2706f10437f373

 src/main/java/com/example/jz/service/impl/GroupUserServiceImpl.java

@@ -16,4 +16,3 @@
public class GroupUserServiceImpl extends ServiceImpl<GroupUserDao, GroupUser> implements GroupUserService {

}