Yes, that is normal. The ESN is stored inside the Qualcomm CDMA chip. If your CDMA chip is fried then that would cause both symptoms (Radio = None in the version info and no ESN number displayed because the OS can't talk to the chip to get the info).
Unfortunately this sounds like a hardware issue to me. It's one thing to lose your radio ROM during a flash, but when you see it disappear on its own that's almost always a dying/dead CDMA or Flash chip.
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