修改注册时密码长度的提示信息，和前端保持统一

src/main/java/cn/quantgroup/xyqb/service/sms/impl/SmsServiceImpl.java

@@ -68,6 +68,9 @@ public class SmsServiceImpl implements ISmsService {
         }
         String key = Constants.REDIS_PREFIX_VERIFICATION_CODE + phoneNo;
         String randomCode = stringRedisTemplate.opsForValue().get(key);
+        if(StringUtils.isEmpty(randomCode)){
+            return false;
+        }
         String[] arr = randomCode.split(":");
         String unqiueId = arr[0];
         String code = arr[1];