Ticket #32630: 32630.diff

src/wp-includes/nav-menu.php

@@ -146 +146 @@
  * @return bool Whether location has a menu.
  */
 function has_nav_menu( $location ) {
+        $has_nav_menu = false;
+
         $registered_nav_menus = get_registered_nav_menus();
-        if ( ! isset( $registered_nav_menus[ $location ] ) ) {
-                return false;
+        if ( isset( $registered_nav_menus[ $location ] ) ) {
+                $locations = get_nav_menu_locations();
+                $has_nav_menu = ( ! empty( $locations[ $location ] ) );
         }
 
-        $locations = get_nav_menu_locations();
-        return ( ! empty( $locations[ $location ] ) );
+        /**
+         * Filter whether a nav menu is assigned to the specified location.
+         *
+         * @since 4.3.0
+         *
+         * @param bool   $has_nav_menu Whether there is a menu assigned to a location.
+         * @param string $location     Menu location.
+         */
+        $has_nav_menu = apply_filters( 'has_nav_menu', $has_nav_menu, $location );
+
+        return $has_nav_menu;
 }
 
 /**