MB-10451: Fix change in views reducer error message

Indexer reducer failure error message is different
in Couchbase 2.5 and 3.0.

Change-Id: I44cb42ce3b81b879c149e7bb335992b1e30850b2
Reviewed-on: http://review.couchbase.org/34680
Tested-by: buildbot <build@couchbase.com>
Reviewed-by: Ketaki Gangal <ketakigangal@gmail.com>