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: 9b790d7ca1ba501ee64436c0c2106382869e3351@7 c788f5bc-977d-0410-a729-c3adb4d6c8b9

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