fix crash

tournaments/models/team_registration.py

@@ -102,7 +102,7 @@ class TeamRegistration(SideStoreModel):
         return "Détail de l'équipe"
 
     def next_match(self):
-        all_matches = [ts.match for ts in self.team_scores.all()]
+        all_matches = [ts.match for ts in self.team_scores.all() if ts.match is not None]
         now = timezone.now()
         all_matches = sorted(all_matches, key=lambda m: m.start_date if m.start_date is not None else now)
         matches = [m for m in all_matches if m.end_date is None]