PYCBC-543: Handle multiresult exception entries without a success field
PYCBC-543: Handle multiresult exception entries without a success field

Change-Id: Ib0ff0a56cf0dea8372998f38a5256ae406439edb
Reviewed-on: http://review.couchbase.org/101850
Tested-by: Build Bot <80754af91bfb6d1073585b046fe0a474ce868509@couchbase.com>
Reviewed-by: Sergey Avseyev <87f6d5e4fd3644c3c20800cde7fd3ad1569370b3@gmail.com>

couchbase/couchbase-python-client,couchbase/couchbase-python-client