[rules-users] How to initialze a query parameter or set an empty list

[ismaximum]

Hi all

So I have this query:

query listPrimaryBenefits(List primaries)
    RuleInsuranceSubtype($subtypeId := id, riderFlag != "Y")  and 
    primaries := List() from collect (InsuranceCover(benefitTypeId ==
$subtypeId, topup == Boolean.FALSE))
end


outside the query and within my rule I have this checking:

rule "Test rule"
when
  listPrimaryBenefits($primaries;)
  eval($priamries == null || primaries.isEmpty())
then 
  assert XXXX


Now, if there is a RuleInsuranceSubtype in WM with given condition,
everuthing is fine and $primaries is empty and being checked in eval
statement BUT if there is no  RuleInsuranceSubtype in WM with riderFlag as N
(which is a valid scenario) then the whole query returns false and as the
result in the rule, my eval statement won't even get executed and its 'when'
returns false.

How can I prevent this? I tried to put OR but don't know how to set
$primaries to an empty or null value. 

Does anybody know how to do this or have a better solution?

Thanks




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