The only thing that occurs to me about wife #1 is that she is the mother of two of his children, so may have been left in the entry for that reason. Plus the divorce was long before Joe Wilson met Valerie, so she wouldn't have been a rival to Valerie the way Jacqueline might have been. Perhaps Jacqueline was removed from the entry to make Valerie happy.
actually I believe Jacqueline's divorce from Joe occurred in 1998, the same year as his marriage to Valerie. Joe was still "married" to Jacqueline while he was diddling a CIA undercover agent/sarc