Can the DateFilter be extended to ignore null or empty

In the snippet I would like to be able to enter in the filter <1.1.1974
and only have Scott show up in the results. It currently includes empty dates.

http://webix.com/snippet/137f8636

I can confirm the issue. Fix will be included in the next build.

Thank you. I have a work around for now, using a textFilter and a custom compare function.