Nick Craig-Wood 115f1c2cc9 operations: speed up hash checking by aborting the other hash if first returns nothing
This speeds up hash checks when a Hash() function returns "" - this
means that the hash can be canceled for the other side.

In the common case of local hash vs remote hash empty this saves a lot
of time.

See: https://forum.rclone.org/t/rclone-s3-backend-copy-is-2x-slower-than-aws-s3-cp/27321/9
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