DataTable 字段值為空的時候報錯的解決

在使用Datatable的時候，后台返回給前台的值會有空的時候，而這個時候，前台會報錯，這里講防治方法；

$('#datatable1').DataTable( {
                ajax: {
                    "url": 'list',
                    "type": "POST",
                    data:{
                        title : function(){
                            return $("#title").val();
                        }
                    }
                },
                columnDefs: [{"defaultContent": "",
                              "targets": "_all"}],
                columns: [
                    { title: "序號", render:function(data,type,row,meta){
                        return meta.row + 1 + meta.settings._iDisplayStart }, width:"5%" },
                    { title: "推送類型", data:"mp_send_type", width:"5%" }, //x
                    { title: "推送標題", data:"mp_msg_title", width:"15%" },
                    { title: "任務ID(TASK id)", data:"mp_taskid", width:"12%" },//x */
                    { title: "推送時間", data:"mp_send_time", width:"7%" }, //x
                    { title: "推送人數", data:"mp_count", width:"5%" }, //x
                    { title: "操作人", data:"mp_admin_user_name", width:"7%" }, //    x
                    { title: "狀態", render:function(data, type, row){
                        var str = "";
                        if(row.mp_status == "1"){
                            str = "<span class='label label-warning'>推送中</span>";
                        }else if(row.mp_status == "2"){
                            str = "<span class='label label-success'>推送完成</span>";
                        }else{
                            str = "<span class='label label-warning'>推送失敗</span>";
                        }
                        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"
                }
            });

中間的：

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

這一點就是設置默認值為空的時候，不報錯