show real excerpt on archive page

add_filter( 'jnews_module_excerpt', 'customize_jnews_excerpt_on_archive', 99, 4 );

function customize_jnews_excerpt_on_archive( $excerpt, $post_id, $excerpt_length, $except_more ) {
    $post = get_post( $post_id );
    if ( is_archive() ) {
        $new_excerpt = $post->post_excerpt;
        if ( ! empty( $new_excerpt ) ) {
            $excerpt = $new_excerpt;
        }
    }
    return $excerpt;
}