Bug report
TreeView applies aria labels to items that don't have children on double-click 

Reproduction of the problem
1. https://demos.telerik.com/kendo-ui/treeview/remote-data-binding

2. Expand "Andrew Fuller"
3. Double click or press the right arrow key on an item that doesn't have children
4. Inspect the DOM for that item

Expected/desired behavior
aria-busy="true" shall not be added.

Environment
Kendo UI version: [all]
jQuery version: [all]
Browser: [all]