Add meaningful error-message if no sysupgrade is needed

functions/sysupgrade

@@ -6,6 +6,6 @@ function sysupgrade_main() {
   if ! check_local &> /dev/null; then
     echo "Sysupgrade true"
   else
-    echo "Sysupgrade false"
+    printc "r" "There is no never version of NOVOS available, thus sysupgrade has been cancelled"
   fi
 }