Mumbai - Domestic credit ratings agency Crisil on Wednesday said the unrest in Iran has not had any impact on Indian companies so far.However, if the tensions persist or escalate, leading to rise in crude prices, companies in oil refining, aviation and crude-linked sectors like specialty chemicals, paints, petrochemicals and synthetic textiles may be impacted, it said."The ongoing unrest in Iran has not had any significant impact on India Inc's global trade, or the credit profiles of domestic corporates thus far," it said.Pointing out that Iran accounts for over 4 per cent of the global . . .