I just ran into this power this week in my own gaming session. I tend to agree that it's a relic of some previous iteration in development because as it stands now, there's not even a definition of "no save" anywhere I can find. Powers that last more than a single round are supposed to have durations. "No save" does not do anything to tell you how long the power should last.
I mean, you can say that it's supposed to last as long as a "save ends" power, but the victim automatically fails the save, but that doesn't seem satisfactory to me.
I'm guessing that it's a mistake, like the Oni Night Haunter, that they failed to catch on their first batch of errata.