I have flashed the iPad baseband on probably over 100 iPhones and have never seen a issue where it came back with no baseband. I have seen a few people say it on here though. Hard to tell if they just had bad luck or somehow used redsnow wrong. I would think if apple had changed something I would have seen one by now so I doubt that is the case. Do as Annie said and try flashing it again.
I've seen it twice on here. I feel it's bad luck though. Or a sudden hardware failure? That happens too, one day it's fine the next the hardware just fails.