Hi there and thanks for providing such a useful chart package for Flutter. I dare to say this is the best chart package so far.
I have a question though:
I would like to use AreaSeries with EmptyPointMode.average.
In case, I have one missing y value in between two existing ones, the average mode works just fine and calculates average. If however, I have let's say two missing values, where the next follows the first one, e.g.:

  final List<_ChartData> chartData = <_ChartData>[
    _ChartData('China', 0.541),
    _ChartData('Brazil', null),
    _ChartData('Egypt', null),
    _ChartData('Bolivia', 1.51),
    _ChartData('Mexico', 1.302),
    _ChartData('Mongolia', 1.683),
  ];

the average is not calculated and I have a gap rather than the expected average value. Is that the expected chart behavior? In case it is, is there a way to override it, e.g. to calculate average based on the existing points which wrap the missing y values ones?