[Fix-16492][alert] FeiShuSender Exception.getMessage is null (#16498)

* Update FeiShuSender.java

The Exception.getMessage present here is null, and the problem has occurred

* Update dolphinscheduler-alert/dolphinscheduler-alert-plugins/dolphinscheduler-alert-feishu/src/main/java/org/apache/dolphinscheduler/plugin/alert/feishu/FeiShuSender.java

Co-authored-by: xiangzihao <zihaoxiang@apache.org>

---------

Co-authored-by: xiangzihao <zihaoxiang@apache.org>

dolphinscheduler-alert/dolphinscheduler-alert-plugins/dolphinscheduler-alert-feishu/src/main/java/org/apache/dolphinscheduler/plugin/alert/feishu/FeiShuSender.java

@@ -134,7 +134,7 @@ public final class FeiShuSender {
             String resp = sendMsg(alertData);
             return checkSendFeiShuSendMsgResult(resp);
         } catch (Exception e) {
-            log.info("send fei shu alert msg  exception : {}", e.getMessage());
+            log.error("send fei shu alert failed:", e);
             alertResult = new AlertResult();
             alertResult.setSuccess(false);
             alertResult.setMessage("send fei shu alert fail.");