Hide the text 'Agenda:No Agenda Assigned.' in the list view of the planning items (and anywhere else) if the Agenda field was not selected in the Planning profile [SDESK-7136]

Hide the text 'Agenda:No Agenda Assigned.' in the list view of the planning items (and anywhere else) if the Agenda field was not selected in the Planning profile [SDESK-7136] #1407