Condition for checking param is not falsy?

[robross0606]

I need to ensure a parameter, if provided, does not contain a falsy value ('', 0, false, null, undefined, etc.). As far as I can tell, the "notEquals" operator would be unwieldy because it uses !== so I'd have to check each possibility separately. Is that the only built-in way? Must this be a custom operator?

[robross0606]

I tried creating a custom operator for this, but the rules engine still requires that I specify a value on the condition which doesn't make sense for this operator.

 "Condition: constructor \"value\" property required"

So how would I use the current engine, rules and conditions simply to check if something is truthy or falsy?