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[Olav Poppe <olav.poppe@xxxxxx>]

Hi devs, 
I was trying to make a program indicator counting the number of events where a certain field has not been filled. Unless I’ve missing something obvious, it is not really documented how to do this. Neither !#{id}, #{id} == ‘’ nor #{id} == null works, they all become translated into SQL that is invalid and/or does not give the required result in the case of #{id} = ‘’. 

In the end, I was able to make it work by using «is null» and «is not null», but you will then get a «Filter is not evaluating to true or false» message in the GUI, which is not ideal if this is the recommended way to do this?

Regards
Olav