code: def get_categories(self, entry):
          
          try:
              return format_html_join(
                  ', ', '<a href="{}" target="blank">{}</a>',
                  [(category.get_absolute_url(), category.title)
                   for category in entry.categories.all()])
          except NoReverseMatch:
              return ', '.join([conditional_escape(category.title)
                                for category in entry.categories.all()])
docs: Return the categories linked in HTML.