DataLabel is not visible after drillup in pie chart

[Izothep]

Expected behaviour

All dataLabels should be visible in pie chart after drillup

Actual behaviour

When clicking on a point and then making drill-up, dataLabel of previously clicked point is not visible.

Live demo with steps to reproduce

http://jsfiddle.net/BlackLabel/LcwaL9sh/

Click on a point and then make a drill-up

[TorsteinHonsi]

It seems like a bug in Chrome, it fails to render the data label even though the only difference with the others is the opacity attribute.

[TorsteinHonsi]

Since it's a rendering issue in a specific browser, it isn't possible to test against the DOM, so I didn't add a regression test for it.