Handle zero chunk size #265
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The existing implementation of the method getChunkSize(...) (uint64, error), in some cases, can return chunkSize==0 and err==nil. The onus is on the caller to check for such possibility and handle it properly. Callers often use the returned chunkSize as a divisor and a zero chunkSize lead to panic. see #209 This PR intends to update the method implementation to always return an error in case the returned chunkSize value is 0. That way caller need to only worry about error being non-nil. Callers which are ok with 0 chunkSize can check the returned error against ErrChunkSizeZero
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Backport of #263