and keep all those filters at last. (PR#20463) e.g. If field used in color attribute of calendar view does not have value then such sidebar filters will not have string besides filter checkbox in such cases we should set Undefined string and put all those filters at last in filter list Currently we can see issue in calendar of manufacturing orders in db with demo data Related to Issue #1778360 Co-authored-by: Mohammed Shekha <msh@openerp.com>