fix bug for undefined hoursUsed variable

src/Entity/Referral.php

@@ -67,6 +67,7 @@ class Referral
     {
         $this->notes = new ArrayCollection();
         $this->present = new ArrayCollection();
+        $this->hoursUsed = 0.0;
     }
 
     public function getId(): ?Uuid
@@ -194,8 +195,8 @@ class Referral
     {
         $this->notes = $notes;
         $this->hoursUsed = 0.0;
-        
-        foreach($this->notes as $note) {
+
+        foreach ($this->notes as $note) {
             $this->hoursUsed += ($note->calcTimeUsed() / 60);
         }
     }