Remove check on potentialy empty string for Record names.

However, this doesn't actually work in FIRRTL right now,
it would seem that FIRRTL also doesn't like names like '0'.
In FIRRTL, Vecs are output like thing[0], thing[1]. This outputs
Records like thing.0, thing.1.

temp checkin.

Apply the leadingDigitOk, but this doesn't actually work.