throw exception when TableAcl instance not exists

SE/se-lib/UserAcl.php

@@ -186,6 +186,7 @@ class UserAcl {
 
 	public function getTableAcl($tableID) {
 		$tblAcl = TableAcl::getInstance($tableID);
+		if (!$tblAcl) throw new Exception("Brak tabeli nr [{$tableID}]!");
 		$tblAcl->init();
 		return $tblAcl;
 	}