Fix test to run on Travis

tests/Doctrine/Tests/DBAL/Functional/Ticket/DBAL630Test.php

@@ -2,6 +2,7 @@
 
 namespace Doctrine\Tests\DBAL\Functional\Ticket;
 
+use Doctrine\DBAL\Exception\TableExistsException;
 use PDO;
 
 /**
@@ -23,8 +24,9 @@ class DBAL630Test extends \Doctrine\Tests\DbalFunctionalTestCase
 
         $sm = $this->_conn->getSchemaManager();
 
-        if ( ! $sm->tablesExist(array('dbal630'))) {
+        try {
             $this->_conn->exec('CREATE TABLE dbal630 (id SERIAL, bool_col BOOLEAN NOT NULL);');
+        } catch (TableExistsException $e) {
         }
         $this->running = true;
     }