Add error message when launching on unsupported OS #148
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問題点
WSL 環境などの対応した OS ではあるが，ブラウザを開くための対応したコマンドがない環境において，system メソッドでエラーを起こしていた．そのため，ブラウザを直接開くよう指示する内容のエラーメッセージを表示できていなかった．
対処
例外処理を追加し，対応するコマンドがない場合にもエラーメッセージが表示されるようにした．