Hey,
So my scheduler has one resource which is grouped vertical. When I filter that resource so that no item in the resource is matched an error is thrown in the console: "Cannot read property 'timeSlotRanges' of undefined". Expected behavior should be no error and an empty scheduler view.
Example Dojo: http://dojo.telerik.com/iQEli (press the button 'filter')
Other thread about the same issue: http://www.telerik.com/forums/error-filtering-current-week-in-kendo-ui-scheduler