@Override
    public void close() {
      closeQuietly(dataProviders);
      closeQuietly((Object[]) dataProviderIterators);
    }
A fallback iterator that returns a single empty iteration.
<p>
This is used when a feature has no data provider method and iteration behavior is forcefully enabled.

@since 2.3
spock-core/src/main/java/org/spockframework/runtime/DataIteratorFactory.java