infoのscoreサブコマンドやinfoコマンド自体の入力が無いときに、InfoListenerがKeyErrorを吐かないようにした #52
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短い思考時間の場合、思考エンジンがinfoコマンドのscoreサブコマンドや、infoコマンド自体を出力しない場合があります。そのような場合に、InfoListenerやMultiPVListenerのscoreやinfoメソッドがKeyErrorを吐いて止まってしまわないように、infoのパース方法を変更したり、出力の存在をチェックをしたりするように変更しました。