Ebay now require EANs

[ryanteck]

Also related to issue #27

eBay now requires EAN Numbers, Along with them not syncing correctly there also needs to be the option for "Does Not Apply" like the MPN has.

[Frankie6677]

Hi there. Is there any progress on this issue?
We urgently need to be able to send new sales lists to Ebay but these products have no EAN, so we cannot submit them.
Ebay either needs the EAN or "Does not apply" in order to accept an item for sale.
So there urgently needs to be an option in the sales profile to activate "EAN: does not apply".

Without this issue fixed we are stuck now and cannot submit these products to Ebay :-(
And there must be many others with same issue, too.