CBQE-0: fix negative cbcollect test

Change-Id: I9feee385a93d87f8b307accc9865548e6764b4de
Reviewed-on: http://review.couchbase.org/32988
Reviewed-by: Iryna Mironava <irynamironava@yandex.ru>
Tested-by: Iryna Mironava <irynamironava@yandex.ru>