Notification: Fix possible NPE on a review comment
Notification: Fix possible NPE on a review comment

Make the for-loop run only if diff.getHunks() is not null.

yona-projects/yona,bloodybear/yona,Limseunghwan/oss,ahb0327/yobi,brainagenet/yobi,doortts/fork-yobi,ahb0327/yobi,doortts/fork-yobi,naver/yobi,ihoneymon/yobi,ihoneymon/yobi,oolso/yobi,doortts/fork-yobi,doortts/fork-yobi,Limseunghwan/oss,ahb0327/yobi,doortts/forked-for-history,brainagenet/yobi,ihoneymon/yobi,brainagenet/yobi,bloodybear/yona,Limseunghwan/oss,naver/yobi,yona-projects/yona,oolso/yobi,yona-projects/yona,oolso/yobi,bloodybear/yona,yona-projects/yona,doortts/forked-for-history,naver/yobi,bloodybear/yona,doortts/forked-for-history