only set, if new_end_date has some value
only set, if new_end_date has some value

domruf/mockup,plone/mockup,termitnjak/mockup,domruf/mockup,termitnjak/mockup,termitnjak/mockup,domruf/mockup,derFreitag/mockup,termitnjak/mockup,domruf/mockup,derFreitag/mockup,plone/mockup,derFreitag/mockup,derFreitag/mockup,plone/mockup