removed code for checking a user variable is null, as it can't be null
removed code for checking a user variable is null, as it can't be null

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