TreeGrid conditional-cell-styling sample does not load correctly.

[MayaKirova]

Description

An error seems to be thrown:

Steps to reproduce

1. Go to: https://www.infragistics.com/products/ignite-ui-angular/angular/components/treegrid/conditional-cell-styling#demo-1

Result

TreeGrid does not load correctly:

Expected result

Should load with no error.

Attachments

Attach a sample if available, and screenshots, if applicable.

[mddragnev]

This is not issue in the sample. Related issue in the lib: IgniteUI/igniteui-angular#11259 and the following PR: IgniteUI/igniteui-angular#11260