Although media pundits last year speculated about potential sponsor fallout following issues related to domestic violence, the controversy had little impact on the National Football League’s ability to attract and retain sponsors.Sponsorship revenue for the NFL and its 32 teams grew 7.8 percent to $1.15 billion in the 2014 season, according to IEG Research.Demonstrating the league’s resilience to controversy, the spending increase is nearly double the 4.2 percent increase in the over...