Fixed bug causing qview and spiceinit to hang on images with bad pointing. ...

Fixed bug causing qview and spiceinit to hang on images with bad pointing.  Fixes Mantis issue #1343.

git-svn-id: http://subversion.wr.usgs.gov/repos/prog/isis3/trunk@4942 41f8697f-d340-4b68-9986-7bafba869bb8