Issue #2625138 by almaudoh, Oleksiy: EntityRepository::loadEntityByUuid()...

Issue #2625138 by almaudoh, Oleksiy: EntityRepository::loadEntityByUuid() implementation does not match EntityRepositoryInterface::loadEntityByUuid() @return documentation

core/lib/Drupal/Core/Entity/EntityRepository.php

@@ -56,7 +56,7 @@ public function loadEntityByUuid($entity_type_id, $uuid) {
 
     $entities = $this->entityTypeManager->getStorage($entity_type_id)->loadByProperties([$uuid_key => $uuid]);
 
-    return reset($entities);
+    return ($entities) ? reset($entities) : NULL;
   }
 
   /**