jQuery Grid Plugin - jqGrid

Hello!

I have tried searching for this problem on this forum and inside the documentation, but have not found an answer for the following:

I am using jqgrid and the cellEdit feature. And it works quite well.

Now, I am wondering if the following is a default configuration or a bug:

Whenever I edit a cell that loads with a value and change it to nothing, it comes back to the previous value!

Example

Before: "test"
Change to: "test2"
Result after refresh: "test2"
That is, as expected

but the following is not what I want

Before: "test"
Change to: "" <-- nothing
Result after refresh: "test"
That is, not what I expected or want. I would like the cell to be empty!

I have tried the following:

-----------------------------------------
afterSaveCell:function(rowid,fieldname,value,iRow,iCol){
  if(value == '') {
  alert("empty!");
  jQuery("#list").setCell(rowid,fieldname,"&nbsp;");
   
  }
},
-----------------------------------------

I have also tried, undefined or null, but still does not work

And the alert works when I leave the cell empty, so it seems like it is intercepted correctly, but when I refresh the previous content of the cell comes back!!

How do I change that?

Thanks

nisse