[Bug 732535] openni2src: Various fixes

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=732535
  GStreamer | gst-plugins-bad | unspecified

--- Comment #4 from Arun Raghavan <arun at accosted.net> 2014-07-01 06:54:02 UTC ---
Created an attachment (id=279649)
 View: https://bugzilla.gnome.org/attachment.cgi?id=279649
 Review: https://bugzilla.gnome.org/review?bug=732535&attachment=279649

openni2src: Make the location property not be mandatory

Our calls to device open already handle the unset location case (by
opening any available device).

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