Support early-return of falsey values from ready/authorized

[eapache-opslevel]

If you write a resolver's authorized method with a return false, nil in it (to early-return a value of nil), it was treating this just as return false and raising, because the early-return value was not truthy. Instead explicitly check for an array value before splitting it in two.

I also did ready? while I was here since it had the same pattern.

The tests are "correct" but won't fail even without my "fix" because the test schema doesn't implement def unauthorized_object(unauthorized_error), and there are a bunch of tests already relying on it being not implemented. Not sure what the best approach is.
edit: I realized after posting that it was easier and more correct to test for a false/nil distinction which sidesteps the unauthorized_object issue

@rmosolgo @DougEdey

[rmosolgo]

Thanks for the fix!