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@@ -293,7 +293,8 @@ class DownloadPipeline:
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if source not in masters_preloaded:
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# we only need to preload *once* (for the 1st selected slave)
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chunks, _ = hardlink_masters[source]
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- preload(chunks)
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+ if chunks is not None:
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+ preload(chunks)
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masters_preloaded.add(source)
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else:
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# easy: we do not have a filter, thus all items are selected, thus we need to preload all chunks.
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TW