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Companion.JSが入っていないIEで、console.logのエラーを出さない

Companion.JSがインストールされていないIEにおいてconsole.logでエラーを吐いて、
処理が止まってしまうのを回避する方法。
console.logが実行される前に書いておくだけ。

JavaScript
// windoオブジェクトにconsoleオブジェクトが無い場合
if (!('console' in window)) {

    // windowオブジェクトにconsoleオブジェクトを作成
    window.console = {};

    // 作ったconsoleオブジェクトに更に引数をそのまま返すlogオブジェクトを作成
    window.console.log = function(str){return str};
}
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Help us understand the problem. What are the problem?