How does MacroDroid interpret empty variables?

[JoeReMi]

I am trying to make some actions only execute when a variable is empty. Weirdly enough, MacroDroid does not seem to notice it when a variable is not empty. I attached a simple macro that illustrates this.

Is there a way to constrain actions like this?

 

[Endercraft]

You have the regex box ticked. Had this problem one day, in this case it changes the meaning of 'nothing'.

 

[JoeReMi]

You have the regex box ticked. Had this problem one day, in this case it changes the meaning of 'nothing'.

Whoa, that's deep. This app is getting philosophical on me.

(Thank you again!)