Convert middle alignement tabs to spaces, null control

Author: robbiebel

includes/model/class-product-variation.php

@@ -215,11 +215,11 @@ protected function init() {
 				'salePriceRaw'      => function () {
 					return ! empty( $this->wc_data->get_sale_price() ) ? $this->wc_data->get_sale_price() : null;
 				},
-				'shippingClass'		=> function () {
+				'shippingClass'     => function () {
 					$shipping_class_id   = $this->wc_data->get_shipping_class_id();
 					$shipping_class_term = get_term( $shipping_class_id, 'product_shipping_class' );
 
-					if ( ! is_wp_error( $shipping_class_term ) && is_a( $shipping_class_term, 'WP_Term' ) ) {
+					if ( ! is_wp_error( $shipping_class_term ) && ! is_null( $shipping_class_term ) && is_a( $shipping_class_term, 'WP_Term' ) ) {
 						$shipping_class = $shipping_class_term;
 					}