[fnFilter] Display nothing if no checkboxes selected

Right now my datatable is displaying all records, if no checkboxes are selected.

How to display no results, if no checkboxes are selected?

function filterCourses() {
  otable = $('#datatable').dataTable();
  //build a regex filter string with an or(|) condition
  var courses = $('input:checkbox[name="status"]:checked').map(function() {
    return '^' + this.value + '\$';
  }).get().join('|');
  //filter in column 0, with an regex, no smart filtering, no inputbox,not case sensitive
  otable.fnFilter(courses, 10, true, false, false, false);
}