Add author name to article schema if its missing

add_filter( 'aioseo_schema_output', 'add_author_name_when_missing' );

function add_author_name_when_missing( $schema ) {	

	if ( is_single() && 'post' == get_post_type() ) {

		global $post;

		$author_id = $post->post_author;

		$author_name = get_the_author_meta( 'display_name', $author_id );

		foreach ( $schema as &$schemaItem ) {

			if ( isset($schemaItem['@type']) && 'Article' === $schemaItem['@type'] ) {

				if(!isset($schemaItem['author']['name']) || !isset($schemaItem['author']['@type'])){

					$schemaItem['author']['@type'] = 'Person';

					$schemaItem['author']['name'] = $author_name;

				}

			}

		}

	}

	return $schema;

}