Fixed return at fetching uid.
Fixed return at fetching uid.

BaiGang/recomm_engine,sdgdsffdsfff/recomm_engine,BaiGang/recomm_engine,sdgdsffdsfff/recomm_engine,BaiGang/recomm_engine,sdgdsffdsfff/recomm_engine,BaiGang/recomm_engine,sdgdsffdsfff/recomm_engine