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2998b891f3
Lazy digest calculation code introduced a bug in background read repair. The problem is that digest_read_resolver::resolve() destroys one data result (it is moved to a caller to be sent as a reply), so during background digest match there is no value to calculate a digest from. Copying data to the caller would be most elegant solution, but also slowest one, so lets just treat the case where there is only one target queried and skip digest calculation in this case since we know digest_match() will do nothing.