[Bug 747633] decklinkvideosrc: crash in ::VideoInputFrameArrived() callback with video_frame=NULL

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=747633

--- Comment #4 from Tim-Philipp Müller <t.i.m at zen.co.uk> ---
Created attachment 308941
  --> https://bugzilla.gnome.org/attachment.cgi?id=308941&action=edit
decklinkvideosrc: don't crash if we get NULL video frames in the callback

Should just check for NULL video_frame and audio_packet, even if we don't
understand why we get those in the first place.

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