fix SessionService signOut method exception bug

dolphinscheduler-api/src/main/java/org/apache/dolphinscheduler/api/service/SessionService.java

@@ -139,7 +139,6 @@ public class SessionService extends BaseService{
    * @param loginUser login user
    */
   public void signOut(String ip, User loginUser) {
-    try {
       /**
        * query session by user id and ip
        */
@@ -147,8 +146,5 @@ public class SessionService extends BaseService{
 
       //delete session
       sessionMapper.deleteById(session.getId());
-    }catch (Exception e){
-
-    }
   }
 }