PARSE_ONE_ON_FIRST_EXEC 模式下 Node 对象执行 Java 脚本最终 instance.isEnd() 判断空指针问题

标题：PARSE_ONE_ON_FIRST_EXEC 模式下 Node 对象执行 Java 脚本 导致 instance.isEnd() 判断空指针问题

### 描述：

LiteFlow框架（版本：2.13.2）
Spring Boot 3.4.1
集成下， THEN 编排，并行执行流程， **少量偶发**  出现以下 空指针 异常，定位是 ScriptCommonComponent.isEnd 方法中，获取上下文的 Stack 空异常：

```text
2025-07-02 03:20:44.101 ERROR 1 --- [w-main-thread-9] [609342ea3308460280d3b388c3c82c7f] [] [] com.yomahub.liteflow.core.FlowExecutor   : [6710457361491044372]:chain[payment.df.invoice.detail-3] execute error on slot[8]
 java.lang.NullPointerException: Cannot invoke "java.util.Stack.peek()" because the return value of "java.lang.ThreadLocal.get()" is null
    at com.yomahub.liteflow.core.NodeComponent.getRefNode(NodeComponent.java:396) ~[liteflow-core-2.13.2.jar!/:2.13.2]
    at com.yomahub.liteflow.core.ScriptCommonComponent.isEnd(ScriptCommonComponent.java:51) ~[liteflow-core-2.13.2.jar!/:2.13.2]
    at com.yomahub.liteflow.flow.element.Node.execute(Node.java:224) ~[liteflow-core-2.13.2.jar!/:2.13.2]
    at com.yomahub.liteflow.flow.element.condition.ThenCondition.executeCondition(ThenCondition.java:44) ~[liteflow-core-2.13.2.jar!/:2.13.2]
    at com.yomahub.liteflow.flow.element.Condition.execute(Condition.java:58) ~[liteflow-core-2.13.2.jar!/:2.13.2]
    at com.yomahub.liteflow.flow.element.Chain.execute(Chain.java:128) ~[liteflow-core-2.13.2.jar!/:2.13.2]
    at com.yomahub.liteflow.core.FlowExecutor.doExecute(FlowExecutor.java:465) ~[liteflow-core-2.13.2.jar!/:2.13.2]
    at com.yomahub.liteflow.core.FlowExecutor.execute2Resp(FlowExecutor.java:372) ~[liteflow-core-2.13.2.jar!/:2.13.2]
    at com.yomahub.liteflow.core.FlowExecutor.execute2RespWithRid(FlowExecutor.java:322) ~[liteflow-core-2.13.2.jar!/:2.13.2]
    at com.spotter.aetherflow.lite.module.liteflow.FlowEngineExecutorImpl.doRetryExecution2Resp(FlowEngineExecutorImpl.java:162) ~[aetherflow-lite-module-liteflow-engine-1.0-aetherflow-lite-SNAPSHOT.jar!/:na]
    at com.spotter.aetherflow.lite.module.liteflow.FlowEngineExecutorImpl.doExecute2Resp(FlowEngineExecutorImpl.java:113) ~[aetherflow-lite-module-liteflow-engine-1.0-aetherflow-lite-SNAPSHOT.jar!/:na]
    at com.spotter.aetherflow.lite.module.liteflow.FlowEngineExecutorImpl.execute2Resp(FlowEngineExecutorImpl.java:77) ~[aetherflow-lite-module-liteflow-engine-1.0-aetherflow-lite-SNAPSHOT.jar!/:na]
    at com.spotter.aetherflow.lite.module.liteflow.FlowEngineExecutorImpl.lambda$execute2Future$1(FlowEngineExecutorImpl.java:172) ~[aetherflow-lite-module-liteflow-engine-1.0-aetherflow-lite-SNAPSHOT.jar!/:na]
    at java.base/java.util.concurrent.CompletableFuture$AsyncSupply.run(CompletableFuture.java:1768) ~[na:na]
```

### 初步原因分析 - PARSE_ONE_ON_FIRST_EXEC 模式下并发操作导致的问题：
![原因分析](https://foruda.gitee.com/images/1751441975066155626/26ba0200_8533068.png "屏幕截图")
![代码位置](https://foruda.gitee.com/images/1751442206071702077/bfabc73f_8533068.png "屏幕截图")

### 环境信息：

操作系统：Mac M1
JDK版本：Java 21
Spring Boot版本：3.4.1
LiteFlow版本：2.13.2

GVP dromara/liteFlow

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GVPdromara/liteFlow

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