Component with contentQuestion doesn't work correctly.

[andrewtelnov]

The following code will generate error in console. We do not support content question component correctly.

    ComponentCollection.Instance.add({ name: 'comp', questionJSON: { type: 'rating', choices: ['A', 'B'] } });
    const json: any = {
        questions: [
            {
                titleLocation: 'hidden',
                name: 'comp',
                type: 'comp'
            }
        ]
    };
    const survey: SurveyPDF = new SurveyPDF(json, {});