Check if package rates is an array before filtering on it (https://github.com/woocommerce/woocommerce-blocks/pull/9351)

Co-authored-by: Niels Lange <info@nielslange.de>

plugins/woocommerce-blocks/src/Shipping/ShippingController.php

@@ -460,6 +460,10 @@ class ShippingController {
 		if ( count( $valid_packages ) !== count( $packages ) ) {
 			$packages = array_map(
 				function( $package ) {
+					if ( ! is_array( $package['rates'] ) ) {
+						$package['rates'] = [];
+						return $package;
+					}
 					$package['rates'] = array_filter(
 						$package['rates'],
 						function( $rate ) {