cfchart broken in CF 8

In CF 7, cfchart would not plot null values from queries. Here is a sample from a CF 7 server showing the results with a query using NULL values.

http://devmx.jibben.com/cfcharttest.cfm


Here is the same sample chart running on a CF 8 server:

http://dev8.jibben.com/cfcharttest.cfm

Notice how CF 8 generates values for the NULL data?

This is a major problem for me as I do not want to plot null values (CF 7 display is preferred). All of the data I'm working with, zero is a valid value. So, plotting the NULL as a zero is not a good solution. It is preferred to display that the exam was not taken rather and have it appear as though it was taken and the student received zero points.

Is there a work-around or solution to this problem?

I will post the code for this sample chart in the next message.

Thanks,
sj