[KYUUBI #6373] Avoid NPE in get operation log api

# 🔍 Description
## Issue References 🔗

This pull request fixes #6373

## Describe Your Solution 🔧

`ThriftUtils#EMPTY_ROW_SET` is not suitable for OperationLog , so I add a new `LOG_EMPTY_ROW_SET`

## Types of changes 🔖

- [X] Bugfix (non-breaking change which fixes an issue)
- [ ] New feature (non-breaking change which adds functionality)
- [ ] Breaking change (fix or feature that would cause existing functionality to change)

## Test Plan 🧪

#### Behavior Without This Pull Request ⚰️

#### Behavior With This Pull Request 🎉

#### Related Unit Tests

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# Checklist 📝

- [X] This patch was not authored or co-authored using [Generative Tooling](https://www.apache.org/legal/generative-tooling.html)

**Be nice. Be informative.**

Closes #6378 from wForget/KYUUBI-6373.

Closes #6373

f25aa593f [wforget] revert
ef87b3f4c [wforget] revert and fix npe
7219d35de [wforget] add test
06135fe0e [wforget] fix test
c0bd29078 [wforget] [KYUUBI #6373] Add empty RowSet for OpertationLog

Authored-by: wforget <643348094@qq.com>
Signed-off-by: Wang, Fei <fwang12@ebay.com>
(cherry picked from commit 5b6ab1af88)
Signed-off-by: Wang, Fei <fwang12@ebay.com>

kyuubi-server/src/main/scala/org/apache/kyuubi/server/api/v1/OperationsResource.scala

@@ -149,7 +149,11 @@ private[v1] class OperationsResource extends ApiRequestContext with Logging {
         FetchOrientation.withName(fetchOrientation),
         maxRows)
       val rowSet = fetchResultsResp.getResults
-      val logRowSet = rowSet.getColumns.get(0).getStringVal.getValues.asScala
+      val logRowSet = if (rowSet.getColumns != null) {
+        rowSet.getColumns.get(0).getStringVal.getValues.asScala
+      } else {
+        Seq.empty
+      }
       new OperationLog(logRowSet.asJava, logRowSet.size)
     } catch {
       case e: BadRequestException =>