Hover labels don't skip over null hover text #302
Description
http://codepen.io/etpinard/pen/MyYLYd
Hover over the null point. Its hover label shows a,b when it shouldn't show anything.
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http://codepen.io/etpinard/pen/MyYLYd
Hover over the null point. Its hover label shows a,b when it shouldn't show anything.