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Don't save resources with no content. This fixes a bug where urlfetch…
…es were failing, causing null contents to be cached such that they were not refetched. A more elegant solution is probably necessary here in which "permanent" errors like 404 are cached and temporary errors like an unreachable host are cached with a timeout. However, this change is still necessary as resources with null contents are almost certainly always an internal error and so should not be cached.
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