Catering industry leaders have cautioned Hong Kong’s restaurants and bars against treading into grey zones around the city’s Covid-19 social-distancing rules, noting many are serving more people than allowed and failing to set up effective barriers between tables to minimise infection risks.The Wednesday warning was aimed squarely at the many eateries around the city that have separated diners at the same table with small acrylic panels in order to serve more than allowed, rather than using…