config: Fix possible NPE of getSystemEmailAddress
config: Fix possible NPE of getSystemEmailAddress

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