[Bug 789319] Fix up GIR annotations

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=789319

--- Comment #4 from Arun Raghavan <arun at arunraghavan.net> ---
Created attachment 362049
  --> https://bugzilla.gnome.org/attachment.cgi?id=362049&action=edit
meta: Don't return NULL for zero-length gchar** array

This should make things easier for API users.

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