docs: def clear_first_angle_projection(self):
          """stub"""
          if (self.get_first_angle_projection_metadata().is_read_only() or
                  self.get_first_angle_projection_metadata().is_required()):
              raise NoAccess()
          self.my_osid_object_form._my_map['firstAngle'] = \
              self._first_angle_metadata['default_boolean_values'][0]