Pie Chart Display Issue

Problem:
1% and 33% in the pie chart is caused by giving the last series entry a value of 0 as you can see in this demo and attached screenshot.

Solution:
About this issue of getting the extra 1% display on one of the sectors of the pie chart, the problem is that the ZingChart library tries to compensate the "gap" from 99.9...99 to 100. This is why %npv is not zero. You should use %node-value in rules as you can see in this demo.