Merge branch '3.4' into 4.4

* 3.4:
  Fix CS
  [Validator] Add Polish translation for ISIN constraint

Author: fabpot

Cloner/VarCloner.php

@@ -114,7 +114,6 @@ protected function doClone($var)
                     case \is_int($v):
                     case \is_float($v):
                         continue 2;
-
                     case \is_string($v):
                         if ('' === $v) {
                             continue 2;