Update src/wp-includes/abilities/class-wp-settings-abilities.php

Co-authored-by: Dovid Levine <justlevine@gmail.com>

Author: jorgefilipecosta

src/wp-includes/abilities/class-wp-settings-abilities.php

@@ -417,7 +417,7 @@ public static function execute_update_settings( $input = array() ): array {
 
 				$sanitized_value = rest_sanitize_value_from_schema( $value, $schema );
 
-				if ( ! empty( $args['sanitize_callback'] ) && is_callable( $args['sanitize_callback'] ) ) {
+				if ( isset( $args['sanitize_callback'] ) && is_callable( $args['sanitize_callback'] ) ) {
 					$sanitized_value = call_user_func( $args['sanitize_callback'], $sanitized_value );
 				}