use md5.hexdigest instead of md5.digest, this was suggested by yo

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@723 20353a03-c40f-0410-a6d1-a30d3c3de9de

product/ERP5Form/ListBox.py

@@ -680,7 +680,7 @@ class ListBoxWidget(Widget.Widget):
         # selection is the same
         sorted_object_uid_list = copy(object_uid_list)
         sorted_object_uid_list.sort()
-        md5_string = escape(md5.new(str(sorted_object_uid_list)).digest())
+        md5_string = escape(md5.new(str(sorted_object_uid_list)).hexdigest())
         #md5_string = md5.new(str(object_uid_list)).digest()