How to display Empty row if Ajax response is empty

Hi, i am new to Datagrid. I am working on a CV management system in which i am using datatable Plugin to show all applicants via AJAX. I have a filter form which will will filter the data via different criteria using AJAX.

everything is working fine. But the issue is When server sends no/empty data, then i don't understand how to display an empty rows of table and display an error message i.e. "No records found."

Here is the Code

//this function will be called in document.ready() with parameter as 0;

function display_applicant_list(req_type){

	if(req_type=='0')
               rander_datatable("");
       else{
                  
                //else condition will run when a filter is applied.

		//destroying and reinitializing
		$("#applicants_list").dataTable().fnDestroy();

                var params = "params";
                //randering datatable
		rander_datatable(params);

		//hiding the filter div
		$("#filter_div").hide();
	}
}


function rander_datatable(params){
$('#applicants_list').dataTable( {
		"bProcessing": true,
		"bServerSide": true,
		"sPaginationType": "bootstrap",					
		"sDom": '<"H"Cfr>t<"F"ip>',
		"oColVis": {
			"activate": "mouseover",
			"aiExclude": [ 10 ],
			"sAlign": "left"
		},
		"bFilter": false,
		"sAjaxSource": "script.php",
		"aoColumns": [
		              {"bSortable": true }, // attachments
		              {"bSortable": true }, //Subject Line
		              {"bSortable": true }, // Date Sent
		              {"bSortable": true }, // File Name
		              {"bSortable": false },
		              {"bSortable": false },
		              {"bSortable": true },
		              {"bSortable": true },
		              {"bSortable": true },
		              {"bSortable": false }
		],
		 "aaSorting": [[0, 'desc']]
	} );
}