fix SummarizeValues to return last non-NaN value #848
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When
SummarizeValuesis called withlastorcurrentas the aggregation function, it returns the last value of the series, whether it is NaN or not. This causeslegendValueto output "NaN" in the legend, even if there are non-NaN values the series.This PR changes the behavior of
SummarizeValuesso that the last non-NaN value is returned.