Displaying blanks in a column of dates

Any suggestions about handling blank values in the JavaScript array in a column of dates?

The blank dates appear as "" in the array. I get a result of #ERR in the grid where the blanks would otherwise appear.

I'm using, amongst other lines, the following code:
var date = new Active.Formats.Date;
date.setTextFormat("dd mmm yyyy");
formats = [number, number, string, string, string, date, date, string];
obj.setDataText(function(i, j){return formats[j].dataToText(myData[i][j])});
obj.setDataValue(function(i, j){return formats[j].dataToValue(myData[i][j])});

Is the problem with the array, with the date formatting etc?

Thanks in advance. And thanks for the great widget.

You can control what happens when the value is not a date with the setErrorText and setErrorValue functions (display text and sort value respectively).

date.setErrorText("");
date.setErrorValue(0);

Works beautifully! Thanks for the speedy response.