fix: bet blacklisting for non bets in list

Co-authored-by: Adamantios Zaras <[email protected]>

packages/valory/skills/market_manager_abci/behaviours.py

@@ -152,9 +152,7 @@ def _update_bets(
 
         for bet in self.bets:
             if self.synced_time >= bet.openingTimestamp - self.params.opening_margin:
-                index = self.get_bet_idx(bet.id)
-                if index is not None:
-                    self.bets[index].blacklist_forever()
+                bet.blacklist_forever()
 
         # truncate the bets, otherwise logs get too big
         bets_str = str(self.bets)[:MAX_LOG_SIZE]