Fixing potential crashes

tournaments/models/match.py

@@ -151,12 +151,14 @@ class Match(models.Model):
         for team_score in self.sorted_team_scores():
             if team_score.team_registration:
                 image = team_score.team_registration.logo
+                weight = team_score.team_registration.weight
+                is_winner = team_score.team_registration.id == self.winning_team_id
             else:
                 image = None
+                weight= None
+                is_winner = False
             names = team_score.team_names()
             scores = team_score.scores_array()
-            weight = team_score.team_registration.weight
-            is_winner = team_score.team_registration.id == self.winning_team_id
             walk_out = team_score.walk_out
             team = Team(image, names, scores, weight, is_winner, walk_out)
             livematch.add_team(team)

tournaments/models/team_score.py

@@ -22,10 +22,11 @@ class TeamScore(models.Model):
 
     def team_names(self):
         names = []
-        if self.team_registration.name:
-            names.append(self.team_registration.name)
-        else:
-            names = self.team_registration.team_names()
+        if self.team_registration:
+            if self.team_registration.name:
+                names.append(self.team_registration.name)
+            else:
+                names = self.team_registration.team_names()
         return names
 
     def scores(self):