Fixed MockServerConnection issue when the connection is closed
Fixed MockServerConnection issue when the connection is closed

Set the _connection in  to nil so that when the client reports disconnected, the -closed: method on the connection will not get called.

couchbase/couchbase-lite-ios,couchbase/couchbase-lite-ios,couchbase/couchbase-lite-ios,couchbase/couchbase-lite-ios,couchbase/couchbase-lite-ios,couchbase/couchbase-lite-ios