return null;

if(null != jsonStr  "" != jsonStr){

$.ajax(
    {
     type: "POST",
     data: {
      name: name,
      code: code
     },
     dataType: "json",
     url: "info",
     success: function(jsonStr) {
      if(null != jsonStr  "" != jsonStr){
      
       $("#curator_info").html("ok");
      } else {
       $("#curator_info").html("no");
      }
     }
    }
   );