HOLLYWOOD, Mar. 6, 2001 -- So far it's been a busy week in TV news. Here's a quick round-up:Not a Safe 'Bette':CBS' fledgling sitcom "Bette" has been given the ax. Though the show posted impressive ratings after its premiere last fall, recent numbers have been in the basement. Without question, CBS execs showed no hesitation in pulling the plug on the Bette Midler vehicle: Wednesday night's episode is likely the show's finale, even though four new episodes have already been taped.Locklear to Tak