Fix ZStream#takeWhile stopping on empty chunks #4273
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We go out of our way to drop empty chunks in most
constructors/combinators but some combinators might still emit empty
chunks - namely, ZStream#collect.
I'm not sure why it was implemented this way, but ZStream#takeWhile would stop when encountering an
empty chunk. This fixes the logic there.
Resolves #4272.
Also hardens some of the property checks by enhancing the stream generator to inject empty chunks into the generated streams.