I am using Excel 2003.

I have a Pie chart with the 12 months of the year as my source data. Some months have data, some not yet.

Sample data:
Jan:45%
Feb: 65%
Mar: 56%
Apr:
May:
Jun:
etc.

In Chart Options, Data Label, I checked Category Name and Value.

The months with values are plotted and look fine, but the months (Category Name) with no values are showing on the pie chart on top of each other and it looks messy.

For example, Jan, 45%; Feb, 65%; and Mar, 56% are plotted on the pie chart. But the Category Names of the rest of the 9 months are shown as text boxes on top of each other at the top of the pie. Apr, May, Jun, etc are all in text boxes on top of each other in a unreadable mess.

I know I could make the source data only contain the 3 months with data, but I don't want to have to expand my source data each month.

How can I make the pie chart not show the Category Names where there is no data? Is it possible?

Thanks!