[Bug 673502] [ges][pitivi] Deadlock if there is only audio and video in pipeline

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=673502
  GStreamer | gst-editing-services | 0.10.x

--- Comment #6 from Thiago Sousa Santos <thiago.sousa.santos at collabora.co.uk> 2012-04-23 17:50:22 UTC ---
Created an attachment (id=212627)
 View: https://bugzilla.gnome.org/attachment.cgi?id=212627
 Review: https://bugzilla.gnome.org/review?bug=673502&attachment=212627

utils/timeline: Prevent exception when object wasn't added to track

Check if the object is added to a track before attemping to access
it.

This patch fixes the bug number 2 on this list. I need someone with pitivi
experience to review it. I think the real fault is that the object should
have already been added to a track before this code is reached, but I'm
new to pitivi at the moment.

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