ListableBeanFactory#findAnnotationOnBean SpringBoot 低版本适配, 异常时返回原线程池. (#64)

hippo4j-spring-boot-starter/src/main/java/cn/hippo4j/starter/core/DynamicThreadPoolPostProcessor.java

@@ -73,6 +73,7 @@ public final class DynamicThreadPoolPostProcessor implements BeanPostProcessor {
                 }
             } catch (Exception ex) {
                 log.error("Failed to create dynamic thread pool in annotation mode.", ex);
+                return bean;
             }
 
             DynamicThreadPoolExecutor dynamicExecutor = (DynamicThreadPoolExecutor) bean;