Add this dictionary to your group file:
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isFalse ::= ["false":"true"]
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It returns true if the value is false, and null otherwise. Then you can use it in 'if statements'.
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main(nullValue, falseValue) ::= <<
$if(isFalse.(falseValue))$
falseValue value is false;
$endif$
$if(!isFalse.(nullValue))$
nullValue is NOT false;
$endif$
>>
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