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Some PHP 7.1 compatible code.
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@@ -500,7 +500,7 @@ class AccountRepository implements AccountRepositoryInterface
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*
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* @return null|string
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*/
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private function filterIban(string $iban = null)
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private function filterIban(?string $iban)
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{
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if (is_null($iban)) {
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return null;
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