Validate the credit card if payment is cc on donate page.

Check the stripe errors only if the payment method is credit
card on submit.

Issue #47847

parcel/js/giving_form.jsx

@@ -232,8 +232,10 @@ export function _GivingForm(props) {
         newErrors.push(new NamedError(fieldName, fieldName + ' must be filled out'));
       }
     }
-    for (const stripeField in stripeErrors) {
-      newErrors.push(stripeErrors[stripeField]);
+    if (paymentMethod == 'credit-card') {
+      for (const stripeField in stripeErrors) {
+        newErrors.push(stripeErrors[stripeField]);
+      }
     }
     return newErrors;
   }