add packet test: LpPacketTest

src/main/java/component/MutableDangerousField.java

@@ -10,10 +10,9 @@ import encoding.*;
  * @Copyright: MIN-Group；国家重大科技基础设施——未来网络北大实验室；深圳市信息论与未来网络重点实验室
  */
 public class MutableDangerousField implements TlvComponentBase, IEncodingAble {
-    private ElementContainer blocks;
+    private ElementContainer blocks= new ElementContainer();
 
-    public MutableDangerousField() {
-        blocks = new ElementContainer();
+    public MutableDangerousField(){
     }
 
     /**