[MultiSelectTree, DropDownTree] Failing To Display Delayed Data and Leaving the no Data Template Rendered

[yanmariomenev]

Describe the bug
When toggling the dropdown of both components before data loading completes, the kendoDropDownTreeNoDataTemplate and kendoMultiSelectTreeNoDataTemplate accurately indicate that data is loading.

However, upon completion of data loading, the dropdown fails to switch to displaying the loaded data. Instead, it persists with the content of the kendoDropDownTreeNoDataTemplate and kendoMultiSelectTreeNoDataTemplate, suggesting no data is available despite successful loading.

This seems to be related to changes in version 15.1.0, and versions below that don't replicate the above behavior (example).

To Reproduce
Open the example and follow the instructions:
https://stackblitz.com/edit/angular-yklar6-v1apun?file=src%2Fapp%2Fapp.component.ts,src%2Fapp%2Fapp.module.ts

[stnikolova]

The fix is available in v16.0.0