bug fixed - BoardApp.post(user, project, postId) throws NullPointerException if the postId does not exist.
bug fixed - BoardApp.post(user, project, postId) throws NullPointerException if the postId does not exist.

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