refactor: Refactor serialize_player function to handle empty player.personaname

players.py

@@ -3,7 +3,7 @@ import dota
 def serialize_player(player):
   friend = dota.Friend.get_or_none(steam_id=player.account_id)
   player_data = {
-    'personaname': player.personaname,
+    'personaname': player.personaname if player.personaname else '',
     'nickname': friend.name if friend else '',
     'kills': player.kills,
     'deaths': player.deaths,