Comment 18 for bug 841409

@nik90 Upstream developer already said 'We should still make sure to display something meaningful...' which would also hit the second combo - currently plain empty when no mail app is installed.
Although imho it's rather an aesthetic matter if the combo is just empty or featuring a text telling me their is no app, which I already know.
If I understand git master correctly the option of no available app wasn't considered at all.

If categories would matter then 'osmo' should be available from combo, but it isn't.
.desktop file says
Categories=GTK;Office;Calendar;ContactManagement;

It just isn't among recommended.
~$ gvfs-mime --query text/calendar
Default application for 'text/calendar': gedit.desktop
Registered applications:
 gedit.desktop
No recommended applications