Handle cases when there are multiple EntityWorkflows associated with one entity

src/Bundle/ChillDocStoreBundle/Workflow/AccompanyingCourseDocumentWorkflowHandler.php

@@ -121,10 +121,10 @@ readonly class AccompanyingCourseDocumentWorkflowHandler implements EntityWorkfl
         return false;
     }
 
-    public function findByRelatedEntity(object $object): ?EntityWorkflow
+    public function findByRelatedEntity(object $object): array
     {
         if (!$object instanceof AccompanyingCourseDocument) {
-            return null;
+            return [];
         }
 
         return $this->workflowRepository->findByRelatedEntity(AccompanyingCourseDocument::class, $object->getId());