Fix for the small error handling problem
Fix for the small error handling problem

when handleResponse is called, currentCommand is already 0xff

Change-Id: I090b1f9787935e280b88e832aed3e885f4f27c0d
Reviewed-on: http://review.couchbase.org/30225
Tested-by: Artem Stemkovski <15a0730a27c69f62ab86f2b6c639fca202166c02@couchbase.com>
Reviewed-by: Chiyoung Seo <fcffc23db27b19ee4ebba46695ee6b50e09216a2@couchbase.com>
Tested-by: Chiyoung Seo <fcffc23db27b19ee4ebba46695ee6b50e09216a2@couchbase.com>

teligent-ru/ep-engine,hisundar/ep-engine,membase/ep-engine,couchbase/ep-engine,couchbase/ep-engine,jimwwalker/ep-engine,daverigby/ep-engine,membase/ep-engine,couchbase/ep-engine,teligent-ru/ep-engine,owendCB/ep-engine,jimwwalker/ep-engine,daverigby/ep-engine,jimwwalker/ep-engine,daverigby/kv_engine,sriganes/ep-engine,daverigby/kv_engine,teligent-ru/ep-engine,owendCB/ep-engine,hisundar/ep-engine,sriganes/ep-engine,sriganes/ep-engine,owendCB/ep-engine,daverigby/kv_engine,sriganes/ep-engine,membase/ep-engine,jimwwalker/ep-engine,couchbase/ep-engine,hisundar/ep-engine,owendCB/ep-engine,teligent-ru/ep-engine,daverigby/kv_engine,daverigby/ep-engine,membase/ep-engine,hisundar/ep-engine,daverigby/ep-engine