Disable payment if total amount is less than 1

Author: nbarbey-os-alter

PayPlugModule.php

@@ -60,6 +60,10 @@ public function update($currentVersion, $newVersion, ConnectionInterface $con =
 
     public function isValidPayment()
     {
+        if ($this->getCurrentOrderTotalAmount() < 1) {
+            return false;
+        }
+
         /** @var PaymentService $paymentService */
         $paymentService = $this->container->get('payplugmodule_payment_service');
         return $paymentService->isPayPlugAvailable();