On the Codex page for wp_list_categories(), you can see the two following arguments that might help you:
hide_empty: Toggles the display of categories with no posts. The default istrue(hide empty categories).current_category: Allows you to force thecurrent-catCSS class to appear on uses ofwp_list_categories()that are not on category archive pages.
Note that current_category only accepts one category ID. If you have a post that belongs to two categories, you will have to choose one.
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