Series count is not adjusted to the consumed columns

[TorsteinHonsi]

Steps to reproduce:

1. Load sample data "Categorized, four data columns".
2. In Templates, select the Area => Arearange template.
3. Note that Series 3 and 4 are still in the legend, even though they have no data.

Compare with the same flow in Cloud, where we only have two series. The logic behind this is that the data module returns only two data sets, because it inspects the given series types and consumes the number of columns according to the series type's pointArrayMap.

[TorsteinHonsi]

PS: It also fails when changing Data Series options. Try changing the type from a series type that consumes one value column (like line, column etc) to one that consumes two (like column range, arearange). Or the other way around.

[cvasseng]

ef75d9f should fix this.