CBQE-1806: fix non_json queries test

Change-Id: I699a769df59e64b13682e400b390c66a4f87c6c4
Reviewed-on: http://review.couchbase.org/31573
Reviewed-by: Iryna Mironava <irynamironava@yandex.ru>
Tested-by: Iryna Mironava <irynamironava@yandex.ru>