Fixes walk_out display issues

tournaments/models/match.py

@@ -190,7 +190,7 @@ class Team:
         self.scores = scores
         self.weight = weight
         self.is_winner = is_winner
-        self.walk_out = walk_out
+        self.walk_out = walk_out is not None
 
     def to_dict(self):
         return {
@@ -215,7 +215,7 @@ class LiveMatch:
 
     def add_team(self, team):
         self.teams.append(team)
-        if team.walk_out:
+        if team.walk_out is not None:
             self.has_walk_out = True
 
     def to_dict(self):