ListBox draggable.enabled = false throws error when trying to remove the placeholder

[iordanGrancharov]

Bug report

If draggable.enabled is set to false, the dragStart is prevented, however, this triggers the dragCancel event of the draggable instance, which will call the _clear method. Since the dragStart event is prevented, no placeholder's been initialized, so the remove method throws an error when called on undefined.

Reproduction of the problem

1. Open draggable - API Reference - Kendo UI ListBox - Kendo UI for jQuery
2. Try to drag itemB1
3. Inspect the console

Ticket ID: 1680552

Environment

Kendo UI version: 2023.2.718 or higher
Browser: [all]