Disable apply_price_list on customer change from Quotation

When you duplicate a Quotation and change the customer, all prices reset to 0.00 because there is a call that applies price list.
In our case we don’t use price list.
For now I just comment the line: me.apply_price_list(); from quotation.js file but I looking for a more elegant solutions to avoid prices are getting changed by this function.
Thanks in advance for any ideas.