amount_other with a value of 0 results in incorrect amount

When specifying an amount_other as 0, function computeAmount() in line 899 and following of CRM/Contribute/Form/Contribution/Main.php returns a null value instead of 0. If specifying an amount as '0.00', it works as expected. This is because while on line 899 we test with isset() on $params['amount_other'] (correctly returning true for 0), on line 903 we use "empty($params['amount_other'])" instead, which returns false for 0.