[amibroker] Empty value in iif()?

["dsb_mac" <dsb_mac@xxxxxxxxxxx>]

How do you assign an empty value? I'm writing an indicator and I 
only want it to display a value when a condition is true. I use an 
iif() with plot(). What can I put in the FALSE portion so that it 
doesn't display any data when the condition is false?

Thanks!





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