Fix syntax error in previous commit.
Fix syntax error in previous commit.

json.Count was missing the parens, but instead of using
the LINQ Count() method, uses Any() for a performance
enhancement (we only need to find the first or none).

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