[Bug 693401] gstdecodebin2 doesn't set send event on pad before exposing pad

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=693401
  GStreamer | gst-plugins-base | 1.x

--- Comment #7 from Matej Knopp <matej.knopp at gmail.com> 2013-02-14 10:19:36 UTC ---
Created an attachment (id=236026)
 View: https://bugzilla.gnome.org/attachment.cgi?id=236026
 Review: https://bugzilla.gnome.org/review?bug=693401&attachment=236026

Check if value is set

When decodebin can't link demuxer and multiqueue it later tries tries to unset
value that hasn't been set (which results in glib warning)

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