fix: not able to make sales order (#261)

(cherry picked from commit f89eccd)

webshop/webshop/shopping_cart/cart.py

@@ -603,6 +603,13 @@ def get_party(user=None):
 		contact.insert(ignore_permissions=True)
 
 		return customer
+	else:
+		customer = frappe.db.get_value(
+			"Portal User", {"user": user}, ["parent"]
+		)
+
+		if frappe.db.exists("Customer", customer):
+			return frappe.get_doc("Customer", customer)
 
 
 def get_debtors_account(cart_settings):