Adds the given {@link Iterator} to the iterators being collated.
@param iterator the iterator to add to the collation, must not be null
@throws IllegalStateException if iteration has started
@throws NullPointerException if the iterator is null
Add an Iterator to the end of the chain
@param iterator Iterator to add
@throws IllegalStateException if I've already started iterating
@throws NullPointerException if the iterator is null
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