[Bug 784129] event: make DRM system id optional in GST_PROTECTION event

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=784129

--- Comment #8 from Sebastian Dröge (slomo) <slomo at coaxion.net> ---
Making the ID optional is also API breakage: bindings can currently assume that
the ID is never NULL and map them to a non-nullable type.

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