Update window.angular is undefined error.

Currently the error is

window.angular is undefined. This could be either because this is a non-angular page or because your test involves client-side navigation. Currently the AngularJS Library is not designed to wait in such situations. Instead you should explicitly call the "Wait For Angular" keyword.

For the case where test involves client-side navigation it gives ok information about why one is getting this error (Library is not designed to wait in such situations) and what to do (you should explicitly call the "Wait For Angular" keyword). But for the case where this is a non-angular page we could and should give a hint as to what to do in this case; such as use the ignore implicit angular wait functionality.

window.angular is undefined というエラーテキストの出所を特定します。非 Angular ページ向けの案内を更新して ignore implicit angular wait 機能に言及しつつ、既存のクライアントサイドナビゲーションに関する案内は維持し、その後、結果として表示されるエラーメッセージを確認します。