[Bug 666395] playbin2: set uri to a non-existed file in "about-to-finish" causes a CRITICAL warning

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=666395
  GStreamer | gst-plugins-base | 0.10.35

--- Comment #4 from Vincent Penquerc'h <vincent.penquerch at collabora.co.uk> 2012-01-18 15:02:40 UTC ---
This change causes an error to be emitted normally when an error occurs
activating after changing the uri.
I tried to see if the group could be set to NULL on error, but this seems it
could have wider ranging consequences, so this small change seems safest.
I'll push this after some time if nobody has objections or a better way.

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