fix 修复工具类可能出现空指针情况

songgaoshuai

2024-03-27 6954fdec0a01ec0e359cd878cc5af644299a3ed9

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/**
 * 演示用例
 * copy from https://github.com/PowerJob/PowerJob/tree/master/powerjob-worker-samples/src/main/java/tech/powerjob/samples
 */
 
package org.dromara.job;