Hmm, I think that it doesnt matter if you dont publish in your PhD, it shouldnt affect whether you get one or not. It does help, and it will help your career a bit, but a lot is down to luck, supervisor, project etc etc. I think people usually understand that you were learning, and that the quality of your work is usually more a reflection of your super rather than you (to some extent). As someone told me, one paper in nature and everyone looks at it as the supervisors paper. Two papers and then they start to thing there is perhaps something special about the student.