When pinned is set in column definition an error is returned when load the grid

[nrobakova]

Description

When pinned is set in column definition an error is returned when load the grid

• igniteui-angular version: 9.0
• browser: n/a

Steps to reproduce

1. Open dev sample gridRowEdit
2. There the columns are defined with pinned="true"

Note: this is regressed by the PR #6140

Result

An error is returned and the grids are not loaded

Expected result

There shpould be no errors

Attachments

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