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81a02cb7c4
`futures_util::pending!()` macro only yields to the event loop once, resulting in many calls to the `OnDemandJustificationsEngine::next()` made by the tokio reactor even though the on-demand-engine is idle. Replace it with the correct `futures::future::pending::<()>()` function which forever yields to the event loop, which is what we want when the engine is idle. Signed-off-by: Adrian Catangiu <adrian@parity.io>