There are numerous reasons why MKIs may be flying unarmed. Perhaps they are just in the process of transportating themselves. Maybe they are returning after having fired all their payload. Or perhaps they are only simulating weapons instead of actually carrying them for a particualar mission. Many more reasons can be stated so it is not so wierd that MKIs are flying without any payload. As you know, no one carries payload unless absolutely essential in order to preserve the lifetime of both aircraft and missiles.
Indian Navy preparing for the President's Fleet Review on December 20th
President Pratibha Patil will review the naval fleet in Mumbai on December 20, thus becoming the first woman Indian president to do so. More than 60 ships and submarines will participate from the Indian Navy, Coast Guard and the merchant marine service as well. The navy will deploy over 48 aircraft, including the recently inducted MiG-29K and helicopters like the Sea Kings 42C. There is no foreign participation either by way of platforms or delegations. This year new ships such as INS Shivalik would be showcased before the president.