Numerous splitereator impls do not throw NPE for null Consumers

Consider the following code:

        Spliterator<Object> spliterator = Collections.nCopies(0, new Object()).spliterator();
        spliterator.tryAdvance((Consumer)null);
        spliterator.forEachRemaining((Consumer)null);

The expected NPEs would not be thrown.


The following JCK tests will fail due to this issue:

api/java_util/Collections/ncopies/index.html#NCopiesSpliteratorEmpty[characteristics_ORDERED]
api/java_util/Collections/ncopies/index.html#NCopiesSpliteratorEmpty[forEachRemaining_NPE]
api/java_util/Collections/ncopies/index.html#NCopiesSpliteratorEmpty[hasCharacteristics_ORDERED]
api/java_util/Collections/ncopies/index.html#NCopiesSpliteratorEmpty[tryAdvance_NPE]
api/java_util/Collections/ncopies/index.html#NCopiesStream[checkSpliterator]
api/java_util/Collections/ncopies/index.html#NCopiesParallelStream[checkSpliterator]