fix justify code regression: if we're justifying the entire file, and we

fix justify code regression: if we're justifying the entire file, and we
haven't found any paragraph(s), we should refresh the screen and get out
instead of breaking out of the loop and acting as though we've justified
something, so as to avoid a segfault

git-svn-id: svn://svn.savannah.gnu.org/nano/trunk/nano@2384 35c25a1d-7b9e-4130-9fde-d3aeb78583b8