修复试管处理出错时，不继续处理下一个试管的BUG

src/main/java/a8k/app/service/statemgr/TubeStateMgrService.java

@@ -366,6 +366,7 @@ public class TubeStateMgrService {
 		log.error("试管 状态->错误 SampleId:{} \n{}", curProcessingTube.getSampleId(), ZJsonHelper.objectToJson(errors));
 		curProcessingTube.setState(TubeState.ERROR);
 		curProcessingTube.setErrors(errors);
+		curProcessingTube = null;
 	}
 
 	synchronized public void changeTubeStateToProcessComplete() {