重试组件手动执行上报报错

版本：1.6.0
问题：Cannot invoke "java.lang.Class.isAssignableFrom(java.lang.Class)" because the return value of "com.aizuda.snailjob.client.core.retryer.RetryerInfo.getRetryCondition()" is null
使用例子：https://snailjob.opensnail.com/docs/guide/retry/ExecutorMethodRegister.html