class-register-capabilities.php in_array() TypeError fix

$user->roles may be undefined, so passing it into in_array() produces a TypeError. Found this to completely block loading of the WP admin. Simple fix of adding a fallback value.

admin/capabilities/class-register-capabilities.php

@@ -97,7 +97,7 @@ public function map_meta_cap_for_seo_manager( $caps, $cap ) {
 		}
 
 		// User must be of role wpseo_manager.
-		if ( ! in_array( 'wpseo_manager', $user->roles, true ) ) {
+		if ( ! in_array( 'wpseo_manager', $user->roles ?? [], true ) ) {
 			return $caps;
 		}