Fix tooltip not shown for missing dataset-value #2789
Merged
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When two datasets are shown and one does not have all y-values, because they represent some gaps for example, then the position of the tooltip is not calculated correctly, when using mode 'label' or 'dataset'. For those gaps the y-value is set to 'null', which leads to a problem when calculating the tooltip position. This fix checks if the position of every dataset exists, before it is used.
The problem can be seen in this jsbin:
http://jsbin.com/nefasokosi/edit?html,output