Error message in qview regarding AutoRegFactory creation should now only...

Error message in qview regarding AutoRegFactory creation should now only appear when the user is actually registering a point. Fixes #4590.

git-svn-id: http://subversion.wr.usgs.gov/repos/prog/isis3/trunk@7612 41f8697f-d340-4b68-9986-7bafba869bb8