PullRequest: Fix ArrayIndexOutOfBoundsException
PullRequest: Fix ArrayIndexOutOfBoundsException

While showing outdated comment, sometimes ArrayIndexOutOfBoundsException
has occured if the commented line is removed from the newer pullrequest.

side effect: After applying this patch, any comment on a file but not on
a latest commit of the file is considered as a outdated comment.

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