nil properties should never match

Should fix:

    % optica id=hello
    i-3301b54b.inst.aws.airbnb.com
    i-04a2307f.inst.aws.airbnb.com
    i-2202de46.inst.aws.airbnb.com
    i-3501b54d.inst.aws.airbnb.com
    localhost.inst.aws.airbnb.com
    i-7901b501.inst.aws.airbnb.com
    i-d216e1b5.inst.aws.airbnb.com
    i-a0e3adc4.inst.aws.airbnb.com
    i-a2a133d9.inst.aws.airbnb.com