NEW YORK (Variety) - For cable news networks, a war with Iraq may not be such a bad thing. CNN, Headline News, MSNBC and CNBC suffered double-digit drops in year-end ratings vs. 2001, the year that audiences flocked to the television for updates on post-9/11 events. Only Fox News, which has become the prime peacetime cable news destination, experienced significant growth in total-day and primetime versus 2001. In 2002, it climbed 44% to an average of 667,000 total-day viewers, according to Nielsen Media Research. In the same time period and category, second-place CNN slipped 7% to an average of 536,000...