Fix #1251: readFile should be robust to empty ranges #1252
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In case where bytes is 0, read will potentially issue a ranged request on (location, location-1), and this will end up in a failure.
Returning 0 means that 0 bytes have been read, so it's sort of consistent.
I haven't got a local repro (yet), then there is to investigate also why readFile on an empty range is issued.