fix task notes in task post

src/Entity/Task.php

@@ -4,6 +4,7 @@ namespace App\Entity;
 
 use App\Enum\PrioType;
 use App\Repository\TaskRepository;
+use Doctrine\Common\Collections\ArrayCollection;
 use Doctrine\Common\Collections\Collection;
 use Doctrine\DBAL\Types\Types;
 use Doctrine\ORM\Mapping as ORM;
@@ -58,6 +59,7 @@ class Task
         $this->createdBy = $createdBy;
         $this->assignedTo = $assignedTo;
         $this->createdAt = new \DateTimeImmutable();
+        $this->taskNotes = new ArrayCollection();
     }
 
     public function getId(): ?int