When a fetcher doesn't get a result must return a FetchResult,the void content of the fetchrestult is not managed, the PipelineManager must handle null Contents
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If an empty result is caused by an error Fetchers must raise an appropriate exception, otherwise they must return a FetchResult with a null content
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If an empty result is caused by an error Fetchers must raise
an appropriate exception, otherwise they must return a
FetchResult with a null content