YOU have been warned - Sylvester Stallone and Arnold Schwarzenegger are not very happy these days. Nothing to do with their film careers, mind. That's ticking over nicely. It's more to do with their joint sideline of selling hamburgers with Tinseltown dressing. It appears that two canny Indian businessmen have decided to coin in on the highly-visible Planet Hollywood image by opening a chain of similar fast food joints called, wait for it . . . Planet Bollywood. The first is lined up for London's West End and we hear Sly and Arnie are already getting into Rambo and Terminator mode respectively to take on the upstarts - with their lawyers providing the supporting cast. Does this mean that plans for a Planet Bollywood, Hong Kong in Peking Road or thereabouts will be put on hold?