Fix url_to_postid() fix

Author: jrfnl

src/wp-includes/rewrite.php

@@ -504,14 +504,14 @@ function url_to_postid( $url ) {
 	if ( is_string( $url_host ) ) {
 		$url_host = str_replace( 'www.', '', $url_host );
 	} else {
-		return 0;
+		$url_host = '';
 	}
 
 	$home_url_host = parse_url( home_url(), PHP_URL_HOST );
 	if ( is_string( $home_url_host ) ) {
 		$home_url_host = str_replace( 'www.', '', $home_url_host );
 	} else {
-		return 0;
+		$home_url_host = '';
 	}
 
 	// Bail early if the URL does not belong to this site.