There are no blank agendas in Netrunner,** but Braintrust comes pretty darn close.
Even if you could advance Braintrust after scoring it, it would still be a pretty iffy deal. Pay $2 and 2 clicks to reduce rez costs by 1? You'll have to rez four more ICE before you even break even!
What's worse, scoring an over-advanced Braintrust is incompatible with using it effectively: - You want to score it early, but you also need a surplus $2 and 2 clicks - You want to score it before rezzing much ICE, but it has to be protected enough to install-advance-advance - If you're a trappy corp that can bluff it out with Mushin or Kakurenbo, you probably aren't running much ICE
Between this and Project Yadi-Uga (only a bit less useless) it seems clear that NR designers feel that red 2/3 agendas would be OP if they actually did something. Compare these to Beale, Atlas, and Vitruvius. Apparently it's okay for red to have a few 2/3s, but they'd better not also be useful.
** except Vanity Project, but just being a 4/6 is special in itself