Use return variable in "print when expression"

[byron.ullauri]

I have a subreport that I want to print only when it has data,  My approach to this is to return a variable (boolean) that checks if the first value of a field is null. 
In the master report,  I added a "dummy group" band to place the subreport in and in the "print when expression" for the band I placed the returned variable. 

The issue is that the band never prints even when I explicitly set the returned variable to true in the subreport.

I tried placing the variable itself in a text field on the page footer and it prints the correct value for it.  

[sergey.vishnevetskiy]

In the properties of your subreport just set "When No Data Type" to NULL and it will not show anything, if no data selected.

[byron.ullauri]

Chose subreport and didn't see any "When No Data Type" property on the menu, tried searching for it as well.

Edit:  The "When No Data Type" property belongs to the report itself and corresponds to the "No Data" band