!215 BUGFIX #I7G6BB自定义异步线程池初始化存在并发问题

Merge pull request !215 from 与或非/issue/7G6BB

liteflow-core/src/main/java/com/yomahub/liteflow/flow/element/condition/WhenCondition.java

@@ -229,6 +229,8 @@ public class WhenCondition extends Condition {
 	}
 
 	public void setThreadExecutorClass(String threadExecutorClass) {
+		// #I7G6BB 初始化的时候即创建线程池，避免运行时获取导致并发问题
+		ExecutorHelper.loadInstance().buildWhenExecutor(threadExecutorClass);
 		this.threadExecutorClass = threadExecutorClass;
 	}