If ambiguity in politics is an art, Hong Kong tycoon Li Ka-shing has once again proved to be a master of it.The city’s business leaders have gone public one by one to condemn chaos and violence triggered by the massive anti-government protests. On Thursday, the 91-year-old, Hong Kong’s richest person, took out advertisements in some of the city’s newspapers.Two full-page statements – one in colour and one in black and white – were both signed off with “a Hong Kong citizen Li Ka-shing”. The…