The Panthers got a scare Thursday when Chuba Hubbard injured his knee during a joint practice with the Jets. But coach Dave Canales shared better news about the running back after the workout. Canales told reporters: “Chuba went down — we had big concerns there. The initial testing looks pretty good, so they’re going to follow up. We’ll have more information on him there. “It was testing on his knee, just to make sure everything was stable. It was a really — it was a real-time collision there.” Canales wasn’t questioning the hit, saying it wasn’t “dirty.” “It was two guys faced up on each othe…