Avoid critical errors when addresses is null
Avoid critical errors when addresses is null

https://bugzilla.gnome.org/show_bug.cgi?id=732982

martinra/geary,jimbonator/geary,martinra/geary,geekvigilante/geary,tshikaboom/geary,emersion/geary,AtticHacker/geary,githubnemo/geary,emersion/geary,aatishnn/geary,mjog/geary,aatishnn/geary,robol/geary,glebihan/geary,tshikaboom/geary,robol/geary,glebihan/geary,AtticHacker/geary,martinra/geary,emersion/geary,mjog/geary,jimbonator/geary,robol/geary,aatishnn/geary,tshikaboom/geary,mjog/geary,githubnemo/geary,jimbonator/geary,githubnemo/geary,glebihan/geary,AtticHacker/geary