Empty powermail mapping causes fatal exception
Missing mapping between Caddy and Powermail fields causes fatal error:
FATAL ERROR: getFieldByIdFromPost( $uid ) is called with an empty uid
I may not have all fields available, for example in my case, I didn't have fields Company or Country and it caused this error. I had to map them on some other fields. I think that this shouldn't be mandatory. Unmapped fields should be treated as empty.