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If you plot a sparkline pie where only one point has a non-zero value the chart doesn't show anything. I would expect it to show a filled circle of just one colour corresponding to the point with a value (the main Syncfusion Pie Chart component shows a filled circle if only one data point has a non-zero value).

I've forked and modified your sparkline types demo to change the middle pie chart to have zero y values for all except one point and as you can see it renders blank, unlike the other two: