Hi Ashok,
We regret for the delay in updating you. The issue mentioned here is suspected to be a defect and have created a defect report[ #10708 ] on this issue. And fix for this issue is expected to be available on or before 30th of July 2008.
You can track the progress of this bug fix in the following link.
Defect #10708 - Pie chart is not rendered properly when it contains Zero as dataPoint value.Kindly let us know if you need any other information. Thanks for your patience.
Regards,
Manohari.R