EmpathyContact: don't crash if a contact doesn't have an account
EmpathyContact: don't crash if a contact doesn't have an account

https://bugzilla.gnome.org/show_bug.cgi?id=654256

GNOME/telepathy-account-widgets,Distrotech/telepathy-account-widgets,Distrotech/telepathy-account-widgets,GNOME/telepathy-account-widgets,GNOME/telepathy-account-widgets