Multi is the default api for methods, it is not necessary to explicitly
decorate methods with it, adds clutter and most people use it because
they see that the rest of the code uses it.
Done with `find . -type f -name '*.py' | xargs sed -i '/@api.multi/d'`
Go on the website, create a new product from there
Click on the image to change it, select an unsplash image
Save your product.
Beforer this commit, the image wasn't saved because the qweb field image
did not know what to do with /unsplash/ urls
After this commit, the image is saved on the product (or any object...)
OPW 1936191
closesodoo/odoo#31328