caregory thumbnail plugin fix

patch.php

<?php 


	/** ==================================================
	 * Update thumbnail meta data of a post to category thumbnail.
	 * Only updates if post doesn't have a thumbnail image set by user.
	 *
	 * @param int $post_id  post_id.
	 * @since 2.00
	 */
	public function update_thumbnail( $post_id ) {

		// Skip if current theme doesn't support post thumbnails
		if ( ! current_theme_supports( 'post-thumbnails' ) ) {
			return;
		}

		// Skip post thumbnail update if thumbnail is already set in the post
		if ( has_post_thumbnail( $post_id ) ) {
			return;
		}

		$term_id = $this->choose_term( $post_id );
		if ( 0 < $term_id ) {
			$featured_image_id = intval( get_term_meta( $term_id, 'featured_image_id', true ) );
			update_post_meta( $post_id, '_thumbnail_id', $featured_image_id );
		} else {
			delete_post_meta( $post_id, '_thumbnail_id' );
		}

	}