优化代码

src/main/java/com/diagbot/config/SnnpyJackson2JsonRedisSerializer.java

@@ -22,8 +22,6 @@ public class SnnpyJackson2JsonRedisSerializer<T> implements RedisSerializer<T> {
     private final JavaType javaType;
     private ObjectMapper objectMapper = new ObjectMapper();
 
-    static final byte[] EMPTY_ARRAY = new byte[0];
-
     public SnnpyJackson2JsonRedisSerializer(Class<T> type) {
         this.javaType = this.getJavaType(type);
     }