fix: [internal] Append variable just when not null

app/Console/Command/EventShell.php

@@ -281,7 +281,7 @@ class EventShell extends AppShell
         $userId = $this->args[0];
         $jobId = $this->args[1];
         $eventId = $this->args[2];
-        $oldpublish = $this->args[3];
+        $oldpublish = isset($this->args[3]) ? $this->args[3] : null;
         $user = $this->getUser($userId);
         $this->Event->sendAlertEmail($eventId, $user, $oldpublish, $jobId);
     }

app/Model/Event.php

@@ -3166,16 +3166,20 @@ class Event extends AppModel
             $job = ClassRegistry::init('Job');
             $jobId = $job->createJob($user, Job::WORKER_EMAIL, 'publish_alert_email', "Event: $id", 'Sending...');
 
+            $args = [
+                'alertemail',
+                $user['id'],
+                $jobId,
+                $id,
+            ];
+            if ($oldpublish !== null) {
+                $args[] = $oldpublish;
+            }
+
             $this->getBackgroundJobsTool()->enqueue(
                 BackgroundJobsTool::EMAIL_QUEUE,
                 BackgroundJobsTool::CMD_EVENT,
-                [
-                    'alertemail',
-                    $user['id'],
-                    $jobId,
-                    $id,
-                    $oldpublish
-                ],
+                $args,
                 true,
                 $jobId
             );