Fixes a bug caused by previous fix for mantis 570. Only update right geom if...

Fixes a bug caused by previous fix for mantis 570.  Only update right geom if not loading a new point.  Fixes #828

git-svn-id: http://subversion.wr.usgs.gov/repos/prog/isis3/trunk@4357 41f8697f-d340-4b68-9986-7bafba869bb8