Fix:3501 Omit keys in customerPaymentMethods that have an empty list as a value. (#3502)

* Don't add empty methods key.

Author: budzanowski

assets/js/base/context/cart-checkout/payment-methods/payment-method-data-context.js

@@ -93,13 +93,16 @@ const getCustomerPaymentMethods = ( availablePaymentMethods = [] ) => {
 	}
 	const enabledCustomerPaymentMethods = {};
 	paymentMethodKeys.forEach( ( type ) => {
-		enabledCustomerPaymentMethods[ type ] = customerPaymentMethods[
-			type
-		].filter( ( paymentMethod ) => {
-			return Object.keys( availablePaymentMethods ).includes(
-				paymentMethod.method.gateway
-			);
-		} );
+		const methods = customerPaymentMethods[ type ].filter(
+			( paymentMethod ) => {
+				return Object.keys( availablePaymentMethods ).includes(
+					paymentMethod.method.gateway
+				);
+			}
+		);
+		if ( methods.length ) {
+			enabledCustomerPaymentMethods[ type ] = methods;
+		}
 	} );
 	return enabledCustomerPaymentMethods;
 };