How NOT to draw accumulated line for missing month or NAs?

[nezuko_kamado]

I draw accumulated barchart and line chart  by

rangesum(above(Sum({$<Year ={'2019'}>} Unit), 0, RowNo()))

rangesum(above(Sum({$<Year ={'2020'}>} Unit), 0, RowNo()))

rangesum(above(Sum({$<Year ={'2021}>} Unit), 0, RowNo()))

rangesum(above(Sum({$<Year ={'2022'}>} Unit), 0, RowNo()))

 I don't have data points for Mar and Apr for 2022, but the flat line is drawn for missing month. However, I only want to add line for the months have data point 

I manually designated months to show here

if(Sum({<Month={'Jan','Feb'}>} Unit)=0,Null(),rangesum(above(Sum({$<Year ={'2022'}>} Unit), 0, RowNo())))

But is there any code that only shows month which is not NA or not missing?

[nezuko_kamado · Accepted solution]

I found that, in Qlik, if else doesn't require 'else' parameter always. 

If(Sum({$<Year ={'2022'}>}Unit) > 0, RangeSum(Above(Sum({$<Year ={'2022'}>} Unit),0,RowNo())))