make it compatible with auto_entitylabel in the same form

Problem/Motivation

I tried to use this module together with auto_entitylabel. I have a product form inline with IEF in a node form, to disable too title fields, I have added automatic label for product, and also I have added this commerce_autosku module in the same product variations.

The form is not validating with this message "This value should not be null".

Inspecting it, obviously fails, because autosku was looking for product title to not be null in its not null validator. Maybe it could be executed after auto_entitylabel, or at least be more concise of why it doesn't validate.