Notification: Fix NPE whlie sending an email
Notification: Fix NPE whlie sending an email

The default value should be given in order to avoid a Boolean variable
of null value.

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