[jQuery] Check if callback is empty

[harmstra]

hi all,

In PHP i have:

if ($data = get_order_by_id($order_id))
{
        echo    json_encode($data);
        return TRUE;
} else {
        return FALSE;
}

Jquery:
$.post("/od/get_order/", 
        {order_no: order_no},      
                function(order){
                        $("#name").html(order.name);
                        $("#address").html(order.address);
                        $("#zipcode").html(order.zipcode);
                
                }, 'json');


So if the $order_id in PHP does not exist, the function returns FALSE.
In this case, it like to throw an error on de client
Something like 

$("#zipcode").html('Order does not exist');

But where would i place this piece of code?
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