Same as in ANH when Leia arrived at Yavin base and she said no time for sorrows in regards to Alderaan
Sure she said there was no time for sorrows, but she still said something about it. Nobody cared about it at all.We don't know how much time has passed between TFA and TLJ. It's implied not much (maybe a few hours) but enough to imagine a "Han's dead, mourn later, let's get out of here" speech from Leia.
And TLJ basically picked up right where TFA left off. I expected something about Han. He's everyone's favorite character. (OK not everyone's, but he's still up in the top 5 for everyone.)