remove useless code

lacagette_addons/pos_meal_voucher/static/src/js/screens.js

@@ -249,15 +249,6 @@ odoo.define("pos_meal_voucher.screens", function (require) {
         },
 
         click_paymentmethods_meal_voucher_mixed: function(id) {
-            var order = this.pos.get_order();
-            if (order.get_total_meal_voucher_eligible() == 0) {
-                this.gui.show_popup("alert", {
-                    'title': _t("Meal Voucher 0 amount"),
-                    'body':  _t("can't pay"),
-                });
-                return false;
-            }
-
             var cashregister = null;
             for ( var i = 0; i < this.pos.cashregisters.length; i++ ) {
                 if ( this.pos.cashregisters[i].journal_id[0] === id ){