Automattic / jetpack

				$response[$key] = null;

				$thumb_id = get_post_thumbnail_id( $post->ID );

				if ( ! empty( $thumb_id ) ) {

					$attachment = get_post( $thumb_id );

					if ( ! empty( $attachment ) )

						$featured_image_object = $this->get_attachment( $attachment );

					if ( ! empty( $featured_image_object ) ) {

						$response[$key] = (object) $featured_image_object;

					}

				}

				break;

			case 'format' :

				$response[$key] = (string) get_post_format( $post->ID );

		$thumb_id = get_post_thumbnail_id( $this->post->ID );

		if ( ! empty( $thumb_id ) ) {

			$attachment = get_post( $thumb_id );

			if ( ! empty( $attachment ) )

				$featured_image_object = $this->get_attachment( $attachment );

			if ( ! empty( $featured_image_object ) ) {

				$thumb = (object) $featured_image_object;

			}

		}

		return $thumb;

	}