China broke with more than a quarter-century of tradition by not issuing an economic growth target for 2020, a stark acknowledgment of the challenges facing the world’s second-largest economy as it grapples with uncertainties around the coronavirus pandemic. The unusual move—it’s the first time a formal target has been omitted since the practice began in 1994—suggests Beijing’s leaders aren’t eager to unleash a large-scale stimulus after China’s sharpest contraction in four decades. It foreshadows more economic pain…