Bug report

The Scheduler configured with remote dataSource, vertical grouping and with autoBind: false, throws an error "Cannot read property 'firstChild' of undefined" and the Scheduler layout is not rendered. The behavior is a regression introduced with Kendo UI v 2020.1.114

Reproduction of the problem

1. Run this dojo

Expected/desired behavior

No error should be thrown with the above configuration.

Environment

• Kendo UI version: 2020.2.513
• Browser: [all]