The state’s top court has added another chapter to its book on local government liability in crash, slip- and trip-and-fall cases.The Illinois Supreme Court ruled this week the city of Danville is not immune from suit under a law that shields public entities from liability based on officials’ policy decisions.A majority of justices ruled on Thursday there was no evidence city workers were making a policy choice when they chose not to fix an uneven slab of sidewalk that allegedly caused a woman to trip and …