MB-31307. Skip empty key fetch (treat as not found)
MB-31307. Skip empty key fetch (treat as not found)

Change-Id: I1e935edb1fae1c61d46aa0cc3622c28b5960fa86
Reviewed-on: http://review.couchbase.org/99625
Reviewed-by: Bingjie Miao <f579bf3623d682cbf2ee0beb4370d3c2f2079461@couchbase.com>
Reviewed-by: Isha Kandaswamy <e3cc845ebc6144fc4d71cf5f07a0ce9db6fdfa91@couchbase.com>
Tested-by: Sitaram Vemulapalli <8d86a491dcdf321bac78bef141a8229a59bf9211@couchbase.com>

couchbase/go-couchbase