Fix crash

tournaments/models/tournament.py

@@ -1420,7 +1420,10 @@ class Tournament(BaseModel):
         if self.umpire_custom_contact is not None:
             print(self.umpire_custom_contact)
             return self.umpire_custom_contact
+        if self.event and self.event.creator:
             return self.event.creator.full_name()
+        else:
+            return None
 
     def umpire_mail(self):
         if self.umpire_custom_mail is not None:

tournaments/services/email_service.py

@@ -334,6 +334,7 @@ class TournamentEmailService:
     def _format_umpire_contact(tournament):
         contact_parts = []
         creator_full_name = tournament.umpire_contact()
+        if creator_full_name:
             contact_parts.append(creator_full_name)
 
         if not tournament.hide_umpire_mail: