Notebooks: Fix query results not displaying table rows (#13488)

* fix PQSQL queries not displaying rows

* comment

* change comment and fix unit test

src/sql/workbench/services/notebook/browser/sql/sqlSessionManager.ts

@@ -527,6 +527,10 @@ export class SQLFuture extends Disposable implements FutureInternal {
 			this._dataToSaveMap.set(key, data);
 			this._rowsMap.set(key, []);
 			this.sendIOPubMessage(data, set);
+			// If rows are returned in the initial result set, make sure to convert and send to notebook
+			if (set.rowCount > 0) {
+				this.handleResultSetUpdate(set);
+			}
 		}
 	}