code: def make_result(self):
          
          result = {}
          if self._base_image_build:
              result[BASE_IMAGE_KOJI_BUILD] = self._base_image_build
          if self._parent_builds:
              result[PARENT_IMAGES_KOJI_BUILDS] = self._parent_builds
          return result if result else None
docs: Construct the result dict to be preserved in the build metadata.