delete user stops deleting clubs

tournaments/models/club.py

@@ -3,7 +3,7 @@ import uuid
 
 class Club(models.Model):
     id = models.UUIDField(primary_key=True, default=uuid.uuid4, editable=True)
-    creator = models.ForeignKey('CustomUser', blank=True, null=True, on_delete=models.CASCADE) # string to avoid circular import
+    creator = models.ForeignKey('CustomUser', blank=True, null=True, on_delete=models.SET_NULL) # string to avoid circular import
     name = models.CharField(max_length=50)
     acronym = models.CharField(max_length=10)
     phone = models.CharField(max_length=15, null=True, blank=True)