Rename Swatch if possible

renameSwatches.jsx

var dok = app.activeDocument;
for (var i = 0; i < dok.swatches.length; i++) {
    try {
        dok.swatches[i].name = "prefix" + dok.swatches[i].name; 
    }
    catch(e) {
        // could not rename 
    }
}