issue: Fix NPE when trying to modify an issue.
issue: Fix NPE when trying to modify an issue.

yona-projects/yona,ahb0327/yobi,ihoneymon/yobi,doortts/fork-yobi,naver/yobi,ihoneymon/yobi,bloodybear/yona,yona-projects/yona,Limseunghwan/oss,brainagenet/yobi,bloodybear/yona,bloodybear/yona,ihoneymon/yobi,oolso/yobi,brainagenet/yobi,doortts/forked-for-history,violetag/demo,ahb0327/yobi,ChangsungKim/TestRepository01,brainagenet/yobi,yona-projects/yona,Limseunghwan/oss,naver/yobi,doortts/fork-yobi,Limseunghwan/oss,doortts/forked-for-history,naver/yobi,oolso/yobi,doortts/fork-yobi,violetag/demo,bloodybear/yona,oolso/yobi,doortts/forked-for-history,ChangsungKim/TestRepository01,doortts/fork-yobi,ahb0327/yobi,yona-projects/yona