[Bug 741263] videodecoder: implement caps query

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=741263
  GStreamer | gst-plugins-base | unspecified

--- Comment #6 from Thiago Sousa Santos <thiagossantos at gmail.com> 2014-12-09 19:09:46 UTC ---
Created an attachment (id=292407)
 View: https://bugzilla.gnome.org/attachment.cgi?id=292407
 Review: https://bugzilla.gnome.org/review?bug=741263&attachment=292407

videoutils: return empty if the element has no possible allowed caps

Instead of returning the template caps and having a failure happen
later because there are no possible caps

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