[Bug 723271] videotestsrc: fix a warning if downstream does not propose a buffer pool

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=723271
  GStreamer | gst-plugins-base | 1.x

Julien Isorce <julien.isorce> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|                            |FIXED
   Target Milestone|HEAD                        |1.3.1

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