'finding things which are of type other than \'asset\''

@ddt.data(*MODULESTORE_SETUPS)
def test_find_different(self, storebuilder):

    with storebuilder.build() as (__, store):
        course = CourseFactory.create(modulestore=store)
        asset_key = course.id.make_asset_key('different', 'burn.jpg')
        new_asset_thumbnail = self._make_asset_thumbnail_metadata(self._make_asset_metadata(asset_key))
        store.save_asset_metadata(new_asset_thumbnail, ModuleStoreEnum.UserID.test)
        self.assertIsNotNone(store.find_asset_metadata(asset_key))
        unknown_asset_key = course.id.make_asset_key('different', 'nosuchfile.jpg')
        self.assertIsNone(store.find_asset_metadata(unknown_asset_key))
