Modified error throw to not append a caught message to the current message....

Modified error throw to not append a caught message to the current message. This was printing non UTF-8 characters on some platforms. Updated truth data. References #2407

git-svn-id: http://subversion.wr.usgs.gov/repos/prog/isis3/trunk@6654 41f8697f-d340-4b68-9986-7bafba869bb8