Selection: fixed exception namespace

Author: dg

src/Database/Table/Selection.php

@@ -474,7 +474,7 @@ protected function execute()
 		try {
 			$result = $this->query($this->getSql());
 
-		} catch (DriverException $exception) {
+		} catch (Nette\Database\DriverException $exception) {
 			if (!$this->sqlBuilder->getSelect() && $this->previousAccessedColumns) {
 				$this->previousAccessedColumns = FALSE;
 				$this->accessedColumns = [];