If no connection was enstablished, skip the tearDown operations

tests/Doctrine/Tests/OrmFunctionalTestCase.php

@@ -308,6 +308,11 @@ abstract class OrmFunctionalTestCase extends OrmTestCase
      */
     protected function tearDown()
     {
+        // In case test is skipped, tearDown is called, but no setup may have run
+        if ( ! $conn) {
+            return;
+        }
+
         $conn     = static::$_sharedConn;
         $platform = $conn->getDatabasePlatform();