[Bug 733976] uridecodebin: Does not set the dec->source uri when an error occurred with a first uri and we set a new one in READY state

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=733976
  GStreamer | gst-plugins-base | git

--- Comment #1 from Thibault Saunier <tsaunier at gnome.org> 2014-07-30 13:25:51 UTC ---
Created an attachment (id=282059)
 View: https://bugzilla.gnome.org/attachment.cgi?id=282059
 Review: https://bugzilla.gnome.org/review?bug=733976&attachment=282059

pbutils: discoverer: Always set the pipeline back to NULL after an error

Otherwize the pipeline would be in an wrong state and on the next
iteration any kind of error could happen

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