Sweeps sequel scores well below original Perhaps CBS waited too long to trot out the sequel to last year’s very successful November sweeps miniseries “Category 6.” By the time “Category 7,” about a natural disaster, aired this month, viewers had apparently forgotten about it. Part two of “Category 7” averaged a 4.1 overnight rating among viewers 18-49 last night, down 26 percent versus a 5.5 for part two of “Category 6” last year. Last night’s conclusion was also down 18 percent versus part one, which averaged a 5.0 overnight rating among 18-49s last Sunday. It was a disappointment for CBS,...