AC-12170 :: Coupon code feature is not working properly in the checkout page on Magento 2.4.7

Author: glo17720

app/code/Magento/SalesRule/view/frontend/web/js/view/payment/captcha.js

@@ -66,4 +66,4 @@ define([
             }
         }
     });
-});
+});

app/code/Magento/SalesRule/view/frontend/web/js/view/payment/discount.js

@@ -21,7 +21,9 @@ define([
     if (totals()) {
         couponCode(totals()['coupon_code']);
     }
-    isApplied(couponCode() != null);
+
+    var couponCodeValue = couponCode();
+    isApplied(typeof couponCodeValue === 'string' && couponCodeValue.length > 0);
 
     return Component.extend({
         defaults: {
@@ -69,4 +71,4 @@ define([
             return $(form).validation() && $(form).validation('isValid');
         }
     });
-});
+});