[Bug]: 回放数据时间帧切片异常

### 这个问题是否已经存在？

- [x] 我已经搜索过现有的问题 (https://gitee.com/dromara/northstar/issues)

### 如何复现

1、创建回放网关，订阅沪银指数，配置回放网关2020-06-01至2024-03-24
2、连接网关

### 预期结果

回放数据正常运行。

### 实际结果

```
2024-03-24T15:22:33.128+08:00  INFO 14584 --- [cat-handler-381] o.d.n.web.service.GatewayService         : 连接网关[PLAYBACK_TEST]
2024-03-24T15:22:33.128+08:00  INFO 14584 --- [cat-handler-381] o.d.n.gateway.playback.PlaybackContext   : 回放网关 [PLAYBACK_TEST] 连线。当前回放时间状态：2020-06-01T20:00
2024-03-24T15:22:33.128+08:00  INFO 14584 --- [cat-handler-381] o.d.n.gateway.playback.PlaybackContext   : 数据回放阶段：2020-06-01 -> 2024-03-24
2024-03-24T15:22:33.410+08:00  WARN 14584 --- [ybackCo-virtual] o.d.n.gateway.playback.PlaybackContext   : 回放等待被中断

java.util.concurrent.ExecutionException: java.lang.NullPointerException: Cannot invoke "org.dromara.northstar.gateway.playback.model.DataFrame.add(org.dromara.northstar.common.Timed)" because the return value of "java.util.Map.get(Object)" is null
	at java.base/java.util.concurrent.CompletableFuture.reportGet(CompletableFuture.java:396)
	at java.base/java.util.concurrent.CompletableFuture.get(CompletableFuture.java:2073)
	at org.dromara.northstar.gateway.playback.PlaybackContext.lambda$start$9(PlaybackContext.java:163)
	at java.base/java.util.concurrent.ThreadPerTaskExecutor$TaskRunner.run(ThreadPerTaskExecutor.java:314)
	at java.base/java.lang.VirtualThread.run(VirtualThread.java:309)
Caused by: java.lang.NullPointerException: Cannot invoke "org.dromara.northstar.gateway.playback.model.DataFrame.add(org.dromara.northstar.common.Timed)" because the return value of "java.util.Map.get(Object)" is null
	at org.dromara.northstar.gateway.playback.PlaybackDataLoader.lambda$loadBarDataFrame$5(PlaybackDataLoader.java:101)
	at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.accept(ForEachOps.java:184)
	at java.base/java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:197)
	at java.base/java.util.AbstractList$RandomAccessSpliterator.forEachRemaining(AbstractList.java:722)
	at java.base/java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:509)
	at java.base/java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:499)
	at java.base/java.util.stream.ForEachOps$ForEachOp.evaluateSequential(ForEachOps.java:151)
	at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.evaluateSequential(ForEachOps.java:174)
	at java.base/java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234)
	at java.base/java.util.stream.ReferencePipeline.forEach(ReferencePipeline.java:596)
	at org.dromara.northstar.gateway.playback.PlaybackDataLoader.loadBarDataFrame(PlaybackDataLoader.java:101)
	at org.dromara.northstar.gateway.playback.PlaybackDataLoader.lambda$load$6(PlaybackDataLoader.java:128)
	at org.dromara.northstar.gateway.playback.PlaybackDataLoader.splitByWeek(PlaybackDataLoader.java:113)
	at org.dromara.northstar.gateway.playback.PlaybackDataLoader.lambda$load$7(PlaybackDataLoader.java:123)
	at java.base/java.util.concurrent.CompletableFuture$AsyncRun.run$$$capture(CompletableFuture.java:1804)
	at java.base/java.util.concurrent.CompletableFuture$AsyncRun.run(CompletableFuture.java)
	at java.base/java.util.concurrent.CompletableFuture$AsyncRun.exec(CompletableFuture.java:1796)
	at java.base/java.util.concurrent.ForkJoinTask.doExec$$$capture(ForkJoinTask.java:387)
	at java.base/java.util.concurrent.ForkJoinTask.doExec(ForkJoinTask.java)
	at java.base/java.util.concurrent.ForkJoinPool$WorkQueue.topLevelExec(ForkJoinPool.java:1312)
	at java.base/java.util.concurrent.ForkJoinPool.scan(ForkJoinPool.java:1843)
	at java.base/java.util.concurrent.ForkJoinPool.runWorker(ForkJoinPool.java:1808)
	at java.base/java.util.concurrent.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:188)

2024-03-24T15:22:33.412+08:00  INFO 14584 --- [ybackCo-virtual] o.d.n.gateway.playback.PlaybackContext   : [PLAYBACK_TEST]-历史行情回放已经结束，可通过【复位】重置
2024-03-24T15:22:33.412+08:00  INFO 14584 --- [ybackCo-virtual] o.d.n.gateway.playback.PlaybackContext   : 回放网关 [PLAYBACK_TEST] 断开。当前回放时间状态：2020-06-01T20:00

```

### 截图或视频

Map加个判断是否存在即可即可
![](https://foruda.gitee.com/images/1711265406359376924/047fceaa_467620.png "屏幕截图")

### 问题版本号

v7.1.0

GVP dromara/northstar

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GVPdromara/northstar

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