[rules-users] check whether a key is present in global Map, i.e. mimicking containsKey() behavior

[esstrata]

Yes, I used eval. 
In fact this is the error I'm getting

org.drools.RuntimeDroolsException: productMap.containsKey($pid) == false :
[Error: unable to access property (null parent): containsKey]
[Near : {... Unknown ....}]

And this is the line
eval(productMap.containsKey($pid) == false)

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