detecting if key is empty (handy for detecting if groupland or not)

default
{
    state_entry()
    {
    }

    touch_start(integer total_number)
    {
        string land;
        if(llKey2Name(llGetLandOwnerAt(llGetPos())) == "")
        {
        land = "Group land";   
        }else
        {
         land = "land owned by " + llKey2Name(llGetLandOwnerAt(llGetPos()));  
        }
        llSay(0, land);
    }
}