The sister of an autistic Hong Kong ultramarathon runner who was bumped off a flight in Morocco and left alone in an airport has complained about the “appalling, unprofessional and non-human approach” taken by the country’s largest airline.Royal Air Maroc overbooked a flight and as a result left Wu Man-hang, who suffers from autism, alone in Ouarzazate airport, before sending him four hours across the desert alone in a taxi to Marrakesh, where his nightmare continued.“The issue is appalling,”…