If the pie chart data is such that all wedges have zero value, the pie chart is displayed with each category having an equal portion. This isn't necessarily an intuitive way to display the
information. Since a pie chart with a total value of zero is somewhat undefined, it would probably be good to have a few options:

- Display equally apportioned pie chart (current behavior)
- Do not display a pie chart
- Display a text string instead of the pie chart
- Call a function. Pass a reference to the target DIV so its innerHTML can be easily set

One could argue that user's javascript should catch the zero value condition before PieChart is instantiated, but that's not feasible when the PieChart uses a datasource to download the data from the
server.