Item is re-selected in ComboBox when clearing with backspace

[nelito987]

Bug report

When dataTextField and dataValueField are not set and the value in ComboBox is cleared by using the backspace, the item is selected again.

Reproduction of the problem

1. Open the Dojo
2. Select an item.
3. Clear it with backspace.

Current behavior

The item is selected again.

Expected/desired behavior

The value should be cleared.

Environment

• Kendo UI version: 2018.3.911
• Browser: [all ]

[nelito987]

Related: #4254

[zdravkov]

Introduced after fixing - https://github.com/telerik/kendo/issues/8733