if exists $var

Martin,

I didn't see an answer to this in the documentation, though I may have 
missed it...

How do I check whether a variable exists or not (== null)?

I'm using the ObjectBox servlet and the $servlet variable to read the 
name/value pairs from the query string. But if the user calls a URL that 
doesn't have all the query string variables I'm looking for, I want to use 
defaults.

Ken

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