Defined a function which was thorwing an fatal error on printing invoices after updating to v4.6.3

Fix #186

Author: Shasvat7

woocommerce-delivery-notes/includes/wcdn-template-functions.php

@@ -353,6 +353,15 @@ function wcdn_additional_product_fields( $fields, $product, $order ) {
 	return array_merge( $fields, $new_fields );
 }
 
+/**
+ * Check if a shipping address is enabled
+ * Note: In v4.6.3, we have removed this function but it throws the fatal error on printing the invoice if someone have customized the invoice and copied print-content.php file in thier theme so from v4.6.4 we need to keep this function as blank.
+ *
+ * @param object $order Order object.
+ */
+function wcdn_has_shipping_address( $order ) {
+}
+
 /**
  * Check if an order contains a refund
  *