Apply suggestion to boutique/models.py

boutique/models.py

@@ -267,10 +267,10 @@ class Order(models.Model):
 
         super().save(*args, **kwargs)
 
-    def clean_illegal_items(self):
+    def clean_illegal_items(self) -> int:
         # No suppression if already ordered
         if self.ordered:
-            return False
+            return 0
         deleted_count = 0
         for orderitem in self.items.all():
             if not orderitem.is_available_atm: