Make cancellation immediate is called before execution starts
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Key: JENA-49
URL: https://issues.apache.org/jira/browse/JENA-49
Project: Jena
Issue Type: Sub-task
Components: ARQ
Reporter: Andy Seaborne
Priority: Minor
Currently, one binding is returned because of hasNext=> true implies .next mush
work, done by delaying cancellation until after .next is done.
Instead, know if hasNext has been called and if not, cancel immediately.
Reduces potential user surprise.
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