There was a bug that could be easily reproduced by:
1. Go to *Sales > Products*.
2. Choose list view.
3. Select all.
4. *Export current view > Excel*.
It raised this message to the user:
ReferenceError: instance is not defined
This is all due to a wrong migration from v8 code. `instance` exists no more in
v9, instead we need to use some methods and variables from correct modules.
In order to get visibility on https://www.odoo.com/apps the OCA board has
decided to add the OCA as author of all the addons maintained as part of the
association.