add defaults for cart data totals object (https://github.com/woocommerce/woocommerce-blocks/pull/1896)

plugins/woocommerce-blocks/assets/js/data/cart/reducers.js

@@ -51,7 +51,26 @@ const reducer = (
 			itemsCount: 0,
 			itemsWeight: 0,
 			needsShipping: true,
-			totals: {},
+			totals: {
+				currency_code: '',
+				currency_symbol: '',
+				currency_minor_unit: 2,
+				currency_decimal_separator: '.',
+				currency_thousand_separator: ',',
+				currency_prefix: '',
+				currency_suffix: '',
+				total_items: 0,
+				total_items_tax: 0,
+				total_fees: 0,
+				total_fees_tax: 0,
+				total_discount: 0,
+				total_discount_tax: 0,
+				total_shipping: 0,
+				total_shipping_tax: 0,
+				total_price: 0,
+				total_tax: 0,
+				tax_lines: [],
+			},
 		},
 		metaData: {},
 		errors: [],