Veteran Hong Kong activist Koo Sze-yiu has been sentenced to nine months in jail over a plan to protest against the overhauled District Council race last December. Koo, 78, was convicted of “attempting or preparing to do an act with a seditious intention” under the colonial-era sedition law over a planned protest against the local elections, from which opposition candidates were shut out following an electoral overhaul that guaranteed only “patriots” could govern. Chief Magistrate Victor So, one of the city’s designated national security judges, handed Koo a guilty verdict on Friday morning at…