修复对 NullPointerException 异常的 msg 获取

agent/src/main/java/cn/reghao/devops/agent/ws/event/EventCenter.java

@@ -48,7 +48,7 @@ public class EventCenter {
         } catch (Exception e) {
             String errMsg = e.getMessage();
             if (e instanceof NullPointerException) {
-                errMsg = ExceptionUtil.errorMsg(e);
+                errMsg = ExceptionUtil.stackTrace(e);
             }
 
             log.error("处理消息发生异常: {}", errMsg);

mgr/src/main/java/cn/reghao/devops/mgr/ws/EventCenter.java

@@ -28,7 +28,7 @@ public class EventCenter {
         } catch (Exception e) {
             String errMsg = e.getMessage();
             if (e instanceof NullPointerException) {
-                errMsg = ExceptionUtil.errorMsg(e);
+                errMsg = ExceptionUtil.stackTrace(e);
             }
 
             log.error("处理消息发生异常: {}", errMsg);