DataTable 字段值为空的时候报错的解决详解编程语言

$('#datatable1').DataTable( { 
ajax: { 
"url": 'list', 
"type": "POST", 
data:{ 
title : function(){ 
return $("#title").val(); 
} 
} 
}, 
columnDefs: [{"defaultContent": "", 
"targets": "_all"}], 
columns: [ 
{ title: "序号", render:function(data,type,row,meta){ 
return meta.row + 1 + meta.settings._iDisplayStart }, width:"5%" }, 
{ title: "推送类型", data:"mp_send_type", width:"5%" }, //x 
{ title: "推送标题", data:"mp_msg_title", width:"15%" }, 
{ title: "任务ID(TASK id)", data:"mp_taskid", width:"12%" },//x */ 
{ title: "推送时间", data:"mp_send_time", width:"7%" }, //x 
{ title: "推送人数", data:"mp_count", width:"5%" }, //x 
{ title: "操作人", data:"mp_admin_user_name", width:"7%" }, //    x 
{ title: "状态", render:function(data, type, row){ 
var str = ""; 
if(row.mp_status == "1"){ 
str = "<span class='label label-warning'>推送中"; 
}else if(row.mp_status == "2"){ 
str = "<span class='label label-success'>推送完成"; 
}else{ 
str = "<span class='label label-warning'>推送失败"; 
} 
return str; 
} , width:"10%"} 
] 
,serverSide: true 
,paging:true 
,pagingType: "simple_numbers" 
,lengthChange: true 
,ordering:false 
,info:false 
,pageLength:10 
,searching: false 
,language: { 
"url": "<%=contextPath %>/static/backend/js/Chinese.lang" 
} 
});

columnDefs: [{"defaultContent": "", 
"targets": "_all"}],