ArraySerialized.php

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<?php
namespace Magento\Config\Model\Config\Backend\Serialized;

class ArraySerialized extends \Magento\Config\Model\Config\Backend\Serialized
{
    public function beforeSave()
    {
        $value = $this->getValue();
        if (is_array($value)) {
            unset($value['__empty']);
        }
        $this->setValue($value);
        return parent::beforeSave();
    }
}