[FIX] point_of_sale : Prevent a traceback when adding a global discount on an empty pos, allow use of a numeric pad dot (.) in payment screen.

addons/point_of_sale/static/src/js/screens.js

@@ -1510,7 +1510,8 @@ var PaymentScreenWidget = ScreenWidget.extend({
                     self.validate_order();
                 } else if ( event.keyCode === 190 || // Dot
                             event.keyCode === 110 ||  // Decimal point (numpad)
-                            event.keyCode === 188 ) { // Comma
+                            event.keyCode === 188 ||  // Comma
+                            event.keyCode === 46 ) {  // Numpad dot
                     key = '.';
                 } else if (event.keyCode >= 48 && event.keyCode <= 57) { // Numbers
                     key = '' + (event.keyCode - 48);

addons/pos_discount/static/src/js/discount.js

@@ -23,13 +23,13 @@ var DiscountButton = screens.ActionButtonWidget.extend({
 
         // Remove existing discounts
         var i = 0;
-        do {
+        while ( i < lines.length ) {
             if (lines[i].get_product() === product) {
                 order.remove_orderline(lines[i]);
             } else {
                 i++;
             }
-        } while ( i < lines.length );
+        }
 
         // Add discount
         var discount = - pc / 100.0 * order.get_total_with_tax();