In passthrough mode, always return an error line
In passthrough mode, always return an error line

Change-Id: I0c529a41ec219794b2d6343b8e1737870f41c7d4
Reviewed-on: http://review.couchbase.org/58597
Reviewed-by: Isha Kandaswamy <e3cc845ebc6144fc4d71cf5f07a0ce9db6fdfa91@couchbase.com>
Reviewed-by: Manik Taneja <ab0e3979665ad7ee15da870324c623916e4596d3@couchbase.com>
Tested-by: Manik Taneja <ab0e3979665ad7ee15da870324c623916e4596d3@couchbase.com>

couchbaselabs/go_n1ql,couchbase/go_n1ql