MessageValidator fails on hash arrays that dont have 0 element

Magento\Framework\MessageQueue\Test\Unit\MessageValidatorTest::testInvalidMessageType with data set #11 (array('object_interface', 'Magento\Customer\Api\Data\Cus...face[]'), array(23, 545), 'Data in topic "topic" must be...e[]". ')
PHPUnit\Framework\Exception: Notice: Undefined offset: 0 in /magento/lib/internal/Magento/Framework/MessageQueue/MessageValidator.php:157.

Author: kandy

lib/internal/Magento/Framework/MessageQueue/MessageValidator.php

@@ -119,7 +119,7 @@ protected function validatePrimitiveType($message, $messageType, $topic)
         $realType = $this->getRealType($message);
         if ($realType == 'array' && count($message) == 0) {
             return;
-        } elseif ($realType == 'array' && count($message) > 0) {
+        } elseif ($realType == 'array' && isset($message[0])) {
             $realType = $this->getRealType($message[0]);
             $compareType = preg_replace('/\[\]/', '', $messageType);
         }
@@ -153,7 +153,7 @@ protected function validateClassType($message, $messageType, $topic)
         $realType = $this->getRealType($message);
         if ($realType == 'array' && count($message) == 0) {
             return;
-        } elseif ($realType == 'array' && count($message) > 0) {
+        } elseif ($realType == 'array' && isset($message[0])) {
             $message = $message[0];
             $compareType = preg_replace('/\[\]/', '', $messageType);
         }

lib/internal/Magento/Framework/MessageQueue/Test/Unit/MessageValidatorTest.php

@@ -255,6 +255,14 @@ public function getQueueConfigRequestType()
                 $customerMock,
                 'Data in topic "topic" must be of type "Magento\Customer\Api\Data\CustomerInterface[]". '
             ],
+            [
+                [
+                    CommunicationConfig::TOPIC_REQUEST_TYPE => CommunicationConfig::TOPIC_REQUEST_TYPE_CLASS,
+                    CommunicationConfig::TOPIC_REQUEST => 'Magento\Customer\Api\Data\CustomerInterface[]'
+                ],
+                [1=>23, 3=>545],
+                'Data in topic "topic" must be of type "Magento\Customer\Api\Data\CustomerInterface[]". '
+            ],
         ];
     }
 }