Avoid NPE when m_CreatedWorldGeometry is NULL
Merge remote-tracking branch 'nocnokneo/bug-16066-SliceNavigationController-avoid-CreatedWorldGeometry-NPE' into bug-16066-slicenavigationcontrolloer-check-createdworldgeometry-for-null
Added more NULL checks for m_CreatedWorldGeometry.
Merge branch 'bug-16066-slicenavigationcontrolloer-check-createdworldgeometry-for-null'

* bug-16066-slicenavigationcontrolloer-check-createdworldgeometry-for-null:
  Added more NULL checks for m_CreatedWorldGeometry.
  Avoid NPE when m_CreatedWorldGeometry is NULL