Prevent sending deleted outbox messages; fix #6797
Prevent sending deleted outbox messages; fix #6797

martinra/geary,githubnemo/geary,jimbonator/geary,glebihan/geary,tshikaboom/geary,AtticHacker/geary,mjog/geary,githubnemo/geary,mjog/geary,glebihan/geary,tshikaboom/geary,aatishnn/geary,AtticHacker/geary,aatishnn/geary,AtticHacker/geary,jimbonator/geary,robol/geary,geekvigilante/geary,tshikaboom/geary,martinra/geary,robol/geary,emersion/geary,MohamedIM/geary-unofficial,rschroll/geary,martinra/geary,glebihan/geary,robol/geary,emersion/geary,mjog/geary,mpdeimos/geary,aatishnn/geary,jimbonator/geary,emersion/geary,kpiwko/geary,githubnemo/geary,rschroll/geary,abn/geary