Which one increase risk of gallbladder cancer: acalculus cholecystitis (no stone) or fistula in gallbladder and intestine? ?

Both conditions. By themselves probably do not increase chance of gallbladder cancer. If it does, it is still very very low. Even if you have gallstones, chances of developing gallbladder cancer is very low. Unfortunately, once you develop gallbladder cancer, chances of survival are quite low.