code: def remove_droppable(self, droppable_id):
          
          updated_droppables = []
          for droppable in self.my_osid_object_form._my_map['droppables']:
              if droppable['id'] != droppable_id:
                  updated_droppables.append(droppable)
          self.my_osid_object_form._my_map['droppables'] = updated_droppables
docs: remove a droppable, given the id