robustified instawiz.pl against people who don't have the MD5 module
robustified instawiz.pl against people who don't have the MD5 module

git-svn-id: 899d168eebf4a3093c892305f0c35c7e2d5a315b@7 89e398a0-8ae2-4b47-a508-3d7a1262af8f

UniStuttgart-VISUS/megamol,UniStuttgart-VISUS/megamol,UniStuttgart-VISUS/megamol,UniStuttgart-VISUS/megamol,UniStuttgart-VISUS/megamol