[KYUUBI #1776][FOLLOWUP] Fill empty td tag for Failure Reason column in EngineTable

### _Why are the changes needed?_

Followup #1776

'Failure Reason' column needs to be filled with empty td tag when there is no exception:
![微信截图_20220812135529](https://user-images.githubusercontent.com/17894939/184293709-d2ae7cdd-5625-422d-b6d7-7368429cf600.png)

### _How was this patch tested?_
- [ ] Add some test cases that check the changes thoroughly including negative and positive cases if possible

- [X] Add screenshots for manual tests if appropriate
![微信截图_20220812135453](https://user-images.githubusercontent.com/17894939/184293704-ab7613b2-28ea-4ac0-9aed-e5382251365d.png)

- [ ] [Run test](https://kyuubi.apache.org/docs/latest/develop_tools/testing.html#running-tests) locally before make a pull request

Closes #3223 from wForget/KYUUBI-1776-followup.

Closes #1776

a83d000 [Wang Zhen] [KYUUBI-1776][FOLLOWUP] Fill empty td tag for `Failure Reason` column in EngineTable

Authored-by: Wang Zhen <wangzhen07@qiyi.com>
Signed-off-by: Cheng Pan <chengpan@apache.org>

Author: wForget

externals/kyuubi-spark-sql-engine/src/main/scala/org/apache/spark/ui/EnginePage.scala

@@ -388,7 +388,9 @@ private class StatementStatsPagedTable(
       }
     }
       </td>
-      {if (event.exception.isDefined) errorMessageCell(event.exception.get.getMessage)}
+      {
+      if (event.exception.isDefined) errorMessageCell(event.exception.get.getMessage) else <td></td>
+    }
     </tr>
   }