Github user ajs6f commented on the issue:
https://github.com/apache/jena/pull/323
That's my point-- I don't think you can do a good fluent API for this
without narrowing the `Iterator` contract to exclude `null`s, because you can't
distinguish. We can do that (narrow the contact)-- we own `ExtendedIterator`
and as you say, we aren't pushing `null`s through it for the `Model` API.
So my vote is that we do what you have here, but _also_ add a note to
`ExtendedIterator` guaranteeing that `next()` must not return `null`.
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