run projector only if the cluster is provisioned

to prevent repeated crashes due to empty list of pools returned by /pools

Change-Id: I3fd27d6c3533abe2133c8b1b050b533708563172
Reviewed-on: http://review.couchbase.org/44248
Reviewed-by: Aliaksey Kandratsenka <alkondratenko@gmail.com>
Tested-by: Artem Stemkovski <artem@couchbase.com>