GenericGrid incorrectly handling the lack of values

[at055612]

In GenericGrid line 362 it is assigning an empty array to d.visibleValues if d.values is not present. It should probably not assign .visibleValues at all if .values is not present. I think most of the viz scripts do a test on .visibleValues so this should be ok, but needs to be checked.

        if (!d.hasOwnProperty("visibleValues")) {
            if (d.values) {
                //create a function to expose only the visible values
                d.visibleValues = function() {
                    return d.values.filter(function(d) {
                        //assume true if prop not present
                        return (
                            (!d.hasOwnProperty("isVisible") || d.isVisible) && 
                            (!d.hasOwnProperty("isZoomVisible") || d.isZoomVisible) 
                        );
                    });
                };
            } else {
                d.visibleValues = [];
            }
        }