title: Kendo UI: How to avoid server call when text entered in combobox is less than min length
body: <p>I am using Kendo UI ComboBox "<strong>version:2016:1.112.545</strong>" and using "<strong><a href="http://demos.telerik.com/kendo-ui/combobox/serverfiltering" rel="nofollow">http://demos.telerik.com/kendo-ui/combobox/serverfiltering</a></strong>" as reference. I set the min length as three characters(search string) for the ComboBox. So when I type three characters a request to web server should be done and it is working as expected. Now the problem is when I clear the whole content in the ComboBox, again a request to web server is done(with empty search string). How to avoid this call?</p>
  
  <p>(Note: This issue can be reproduced in the above telerik demos URL. Use the browser's developer tools to monitor the server calls.)</p>