test if files exist in bin dir when using list

tilde

@@ -183,11 +183,13 @@ case $1 in
   list | ls)
     echo -e "available scripts:\n"
     for scr in /tilde/bin/*; do
+      if [ -f "$scr" ]; then
         script_name=$(basename $scr)
         target=$(readlink -f "$scr")
         echo "$script_name by "$(stat_func $target)
         cat /tilde/descriptions/$script_name
         echo ""
+      fi
     done ;;
 
   about | apropos | description)