forall is evaluated as true when there is no fact to match the first pattern in BRMS

Issue

• The combination of the following rule and facts hit the rule. Is it expected?

rule "All guys older than 30 earn more than 1900"
    when
        forall($p : Person( age > 30)
                    Person( this == $p, salary >  1900 )
        )
    then
        System.out.println( "fire!" );
end

            // no person older than 30
            Person john = new Person("john", 24, 2000);
            Person paul = new Person("paul", 22, 1800);
            Person george = new Person("bob", 21, 1600);

            kSession.insert(john);
            kSession.insert(paul);
            kSession.insert(bob);

            kSession.fireAllRules();