Don't trigger exception if payment processor ID not found for IPN, use debug...

Don't trigger exception if payment processor ID not found for IPN, use debug function because we don't have access to getPaymentProcessorLabel() function

CRM/Core/Payment/MJWIPNTrait.php

@@ -38,7 +38,7 @@ trait CRM_Core_Payment_MJWIPNTrait {
    *  The IPN event type
    * @var string
    */
-  protected $event_type = NULL;
+  protected $eventType = NULL;
 
   /**
    * Exit on exceptions (TRUE), or just throw them (FALSE).
@@ -89,15 +89,15 @@ trait CRM_Core_Payment_MJWIPNTrait {
   /**
    * Get the payment processor
    *   The $_GET['processor_id'] value is set by CRM_Core_Payment::handlePaymentMethod.
+   *
+   * @throws \CRM_Core_Exception
+   * @throws \Civi\Payment\Exception\PaymentProcessorException
    */
   protected function getPaymentProcessor() {
-    $paymentProcessorId = CRM_Utils_Request::retrieveValue('processor_id', 'Positive', NULL, FALSE, 'GET');
-    if (empty($paymentProcessorId)) {
-      $this->exception('Failed to get payment processor id');
-    }
+    $paymentProcessorID = CRM_Utils_Request::retrieveValue('processor_id', 'Positive', NULL, TRUE, 'GET');
 
     try {
-      $this->_paymentProcessor = \Civi\Payment\System::singleton()->getById($paymentProcessorId);
+      $this->_paymentProcessor = \Civi\Payment\System::singleton()->getById($paymentProcessorID);
     }
     catch(Exception $e) {
       $this->exception('Failed to get payment processor');
@@ -399,7 +399,7 @@ trait CRM_Core_Payment_MJWIPNTrait {
    * @throws \Civi\Payment\Exception\PaymentProcessorException
    */
   protected function exception($message) {
-    $errorMessage = $this->_paymentProcessor->getPaymentProcessorLabel() . ' Exception: Event: ' . $this->event_type . ' Error: ' . $message;
+    $errorMessage = $this->_paymentProcessor->getPaymentProcessorLabel() . ' Exception: Event: ' . $this->eventType . ' Error: ' . $message;
     Civi::log()->debug($errorMessage);
     if ($this->exitOnException) {
       http_response_code(400);