Do not fail displaying notification when workflow has been deleted

src/Bundle/ChillMainBundle/Resources/views/Workflow/_notification_include.html.twig

@@ -1,11 +1,15 @@
-<h2>
-    {{ 'workflow_'|trans }}
-</h2>
+{% if handler is not null %}
+    <h2>
+        {{ 'workflow_'|trans }}
+    </h2>
 
-<div class="item-row col" style="display: block;">
-    {% include handler.template(entity_workflow) with handler.templateData(entity_workflow)|merge({
-        'description': true,
-        'breadcrumb': true,
-        'add_classes': ''
-    }) %}
-</div>
+    <div class="item-row col" style="display: block;">
+        {% include handler.template(entity_workflow) with handler.templateData(entity_workflow)|merge({
+            'description': true,
+            'breadcrumb': true,
+            'add_classes': ''
+        }) %}
+    </div>
+{% else %}
+    <h2>{{ 'workflow.deleted_title'|trans }}</h2>
+{% endif %}

src/Bundle/ChillMainBundle/Workflow/Notification/WorkflowNotificationHandler.php

@@ -33,7 +33,7 @@ class WorkflowNotificationHandler implements NotificationHandlerInterface
 
         return [
             'entity_workflow' => $entityWorkflow,
-            'handler' => $this->entityWorkflowManager->getHandler($entityWorkflow),
+            'handler' => null !== $entityWorkflow ? $this->entityWorkflowManager->getHandler($entityWorkflow): null,
             'notificationCc' => $this->isNotificationCc($notification),
         ];
     }
@@ -45,6 +45,10 @@ class WorkflowNotificationHandler implements NotificationHandlerInterface
         if (EntityWorkflow::class === $notification->getRelatedEntityClass()) {
             $relatedEntity = $this->entityWorkflowRepository->findOneBy(['id' => $notification->getRelatedEntityId()]);
 
+            if (null === $relatedEntity) {
+                return false;
+            }
+
             if ($relatedEntity->getCurrentStepCreatedBy() !== $this->security->getUser()) {
                 $notificationCc = true;
             }

src/Bundle/ChillMainBundle/translations/messages.fr.yml

@@ -568,6 +568,7 @@ workflow:
     transition_destinee_emails_help: Le lien sécurisé sera envoyé à chaque adresse indiquée
     sent_through_secured_link: Envoi par lien sécurisé
     public_views_by_ip: Visualisation par adresse IP
+    deleted_title: Workflow supprimé
 
     public_link:
         expired_link_title: Lien expiré