CBQE-0: n1ql : output error if any

Change-Id: I4ba195b8a617ad87c56a89a780a8842b8e243cb7
Reviewed-on: http://review.couchbase.org/42537
Reviewed-by: Iryna Mironava <irynamironava@yandex.ru>
Tested-by: Iryna Mironava <irynamironava@yandex.ru>