Fix a bug where Deleted does not fetch the currentRevision before checking it if is null
Fix a bug where Deleted does not fetch the currentRevision before checking it if is null

mpapp/couchbase-lite-net,brettharrisonzya/couchbase-lite-net,z000z/couchbase-lite-net,JiboStore/couchbase-lite-net,z000z/couchbase-lite-net,brettharrisonzya/couchbase-lite-net,couchbase/couchbase-lite-net,mpapp/couchbase-lite-net,couchbase/couchbase-lite-net,couchbase/couchbase-lite-net,JiboStore/couchbase-lite-net