BareCommit: Prevent uninitialized repository error
BareCommit: Prevent uninitialized repository error

Add a comment to note that the repository must have been created and
throw an exception if not when try to lock a ref.

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