Well just look at how much space is set aside for the helipad on the 056 proportionate to the overall size of the ship. It has the same sized helipad as the much bigger 054A class, while most warships (comparing civilian ships to warships is comparing apples to oranges as i know of no cruise ships or yachts that needs torpedo armed helos
) of the 056's size made do with much smaller helipads both in absolute and proportional terms.
It is precisely because space is precious on ships, especially small ships that we really need to ask ourselves exactly why they had allocated so much precious space to have such a bigass helipad on such a small ship. It would be pretty silly to assume the designers made this big design choice without good reason. Having already 'spent' all that space on a helipad comfortably big enough to re-arm helos on (as opposed to just big enough to land on to offload personnel or VREP supplies), it would seem like a complete dumbass thing to do to not set aside the relatively tiny extra amount to space needed to store a few torpedoes and sonobuoys.