However: if you don't have open-source code, I tend to assume you don't do much programming in your free time. And if you don't program in your free time, how are you going to become a really strong developer? How will you get exposed to a range of technologies outside what your employer uses, and a range of problems outside your work domain? At the very least, upload your working from that time you worked through SICP or your experiments with Haskell or the AngularJS page you made for your husband's dog grooming business or whatever.
Job-seekers: when your CV arrives, I will use it to find you on LinkedIn. From LinkedIn, I want to see your CPAN/RubyGems/npm/whatever link and your Github link. I want to see a bunch of endorsements from coworkers and open-source collaborators. Show me your Slideshare account from that time you gave a killer talk on ... whatever. Maybe you spend a bunch of time on StackOverflow or PerlMonks or maybe you wrote and published a killer Ruby tutorial in Brazilian or whatever.
Show me you love programming.