Always send initial event.
Always send initial event.

If client unsubscribes before the initial event could be sent, mark the
subscribtion as "to delete later" and send the event nevertheless.

The subscription will then be deleted before the next notification.

https://bugzilla.gnome.org/show_bug.cgi?id=658486

GNOME/gupnp,GNOME/gupnp,GNOME/gupnp,GNOME/gupnp