Fix #17504: Fix upsert when $updateColumns = true but there are no columns to update in the table

tests/framework/db/mssql/QueryBuilderTest.php

@@ -311,6 +311,9 @@ class QueryBuilderTest extends \yiiunit\framework\db\QueryBuilderTest
             'query, values and expressions without update part' => [
                 3 => 'MERGE {{%T_upsert}} WITH (HOLDLOCK) USING (SELECT :phEmail AS [email], now() AS [[time]]) AS [EXCLUDED] ([email], [[time]]) ON ({{%T_upsert}}.[email]=[EXCLUDED].[email]) WHEN MATCHED THEN UPDATE SET [ts]=:qp1, [[orders]]=T_upsert.orders + 1 WHEN NOT MATCHED THEN INSERT ([email], [[time]]) VALUES ([EXCLUDED].[email], [EXCLUDED].[[time]]);',
             ],
+            'no columns to update' => [
+                3 => 'MERGE [T_upsert_1] WITH (HOLDLOCK) USING (VALUES (:qp0)) AS [EXCLUDED] ([a]) ON ([T_upsert_1].[a]=[EXCLUDED].[a]) WHEN NOT MATCHED THEN INSERT ([a]) VALUES ([EXCLUDED].[a]);',
+            ],
         ];
         $newData = parent::upsertProvider();
         foreach ($concreteData as $testName => $data) {