and what if I want to see a text if that particular category is not present, for example "category does not contain products"

I'm trying to do something similar, I have a list that I want to divide into different categories, I created the tab to navigate the various categories, and I used this code to filter the categories, only I would like to see a text where there are no products in the category, the category does not contain products, but for now I have not yet managed to do it, can anyone help me?