When using Advanced filter mode and leaving one filter empty an error is thrown on product import:
Unable to serialize value. Error: syntax error
This is because Magento\Framework\Serialize\Serializer\Json throws the error when trying to unserialize an empty string.
To solve this issue an empty array will be returned if no filter is set without calling the unserializer.
When using Advanced filter mode and leaving one filter empty an error is thrown on product import:
Unable to serialize value. Error: syntax error
This is because
Magento\Framework\Serialize\Serializer\Json
throws the error when trying to unserialize an empty string. To solve this issue an empty array will be returned if no filter is set without calling the unserializer.