TOKYO, April 13 (Reuters) - The Japanese government said the emergency evacuation warning it issued and later retracted against residents of the northern island of Hokkaido after a North Korean missile launch on Thursday morning was appropriate and not an error. "We did not correct the information issued by the J-Alert" emergency broadcasting system, Chief Cabinet Secretary Hirokazu Matsuno told a news conference. "We did not correct the information issued by the J-Alert" emergency broadcasting system, Chief Cabinet Secretary Hirokazu Matsuno told a news conference