Jack O’Connell has insisted ‘Back to Black’ is a “celebration” of Amy Winehouse. The 33-year-old star plays the late singer’s ex-husband Blake Fielder-Civil in director Sam Taylor-Johnson’s upcoming biopic and while the project has faced criticism for being “tasteless” and coming just 13 years after the ‘Rehab’ hitmaker’s death at the age of 27, the actor thinks the backlash is unfair. He told Sunday Times Culture magazine: “What is the acceptable timescale of that? Put it like this: if we were trying to portray her in any form of negative light, then that might be a valid point and I can unde…