[Bug 641918] [Camerabin2] Allow previewing without capture

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=641918
  GStreamer | gst-plugins-bad | git

--- Comment #12 from Thiago Sousa Santos <thiago.sousa.santos at collabora.co.uk> 2011-07-23 14:44:49 UTC ---
(In reply to comment #10)
> For some reason my review comment got lost. But please use NULL instead of "".

I thought about this, but for some reason we used "" in camerabin1, so I
decided to go with that here as well.

But for me it is ok, I'll update the patch and push.

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