Bug report

If the Gantt is navigatable and editable.reorder is set to false when the user tries to navigate and press Enter on a cell an error is thrown

Regression since: 2020.3.915

Reproduction of the problem

1. Open the Dojo example
2. Navigate for example to 'Task 2'
3. Press 'Enter'

Current behavior

The following error is thrown in the console: r.list._startEditHandler is not a function

Expected/desired behavior

There should be no error in the console.

Environment

• Kendo UI version: 2020.3.1118
• Browser: [all]