How to hide lines in a Line and column chart with field parameters

[kovacikm78]

Hi guys,
I have a Line and Clusterd column chart. Primary Y axix (columns) and secondary Y axis (lines) are based on Field parameters. So I have two slicers with multiselect option where I can choose various matrics to be shown on the chart.
I am dynamicaly choosing metrics for columns and lines. The problem is, when I unselect all checkboxes in the line slicer, I get no data on the chart. In this case, when I unselect all lines checkboxes and leave only checkbox for columns, I want to see only columns in the chart. But I am not able to achieve this goal.

Can you please help me with this?
here is the example of my visual. On the left side is the slicer for columns (blue) and lines (pink):
In this case I should see only columns in my chart (but my chart is blank...)

this should be the final result:

example of my fields parameter for lines

Thank you very much for your help in advance

CHART_Lines = {

           ("Turnover", NAMEOF([Turnover]), 0),

         ("Margin", NAMEOF([Margin]), 1)

....

}

[lbendlin]

The problem is, when I unselect all checkboxes in the line slicer, I get no data on the chart.

I don't think so.  In Power BI one of the weirder paradigms is that "Nothing selected" is (mostly) the same as "everything selected".

see attached