If a series contains only null values the chart will not draw.
Example data ('series_2' contains only null, chart will not draw)...
['','series_1','series_2','series_3'],['2012031701',0.103,null,0.054],
['2012031700',0.123,null,0.954]
If I set one datapoint for 'series_2' to non-null value then chart
will draw correctly.
I would expect chart to draw even if 'series_2' contains only nulls.
Tested using ComboChart.
I'm guessing it's a bug.
Thanks, Mark
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