In a particular case, `_views_get` was mixing apples and oranges, ir.ui.view
and theme.ir.ui.view.
This was the case if a theme has a theme.ir.ui.view t-calling another
theme.ir.ui.view.
(Only theme's sale bridge cause this issue, eg theme_kea_sale.products)
Then, having that theme installed on a website would make all other website
without that theme to crash when opening the /shop customize menu.
Indeed, the theme.ir.ui.view would have the xml_id theme_kea_sale.search.
The generic view `website_sale.products` would have `theme_kea_sale.products`
as inherit child which is website specific and t-call `theme_kea_sale.search`.
Then, on a website witout theme_kea installed, opening the customize menu would
call `get_related_views` that would call `_views_get` that would loop through
inherit children calling `_view_obj` that would not find a view with that key
and would fallback on self.env.ref, finding the theme.ir.ui.view.
Note: `_views_get` might return specific view for another website but that will
be filtered on `get_related_views` override in website.
Step to reproduce:
- Have at least 2 websites and website_sale installed
- Install theme_kea on a website, it will also install theme_kea_sale
- Go on the website that has not theme_kea installed
- Go to /shop
- Open Customize menu, it won't load because of python crash
opw-1914576
Closes#29347
Romain Derie
f7df35540b