Access to deleted attribute triggers a query

[Julien Hartmann]

This is a consequence of the implementation of #26207 in PR ​6118

Now, all fields have a DeferredAttribute descriptor. This has the consequence that this will trigger a model reload:

obj = MyModel.objects.get(pk=1)
del obj.title
obj.title

Up to version 1.9 (included), this code would raise an AttributeError. Now it silently triggers a query to reload the field from the database.

Is this intended? If so, it should probably be added to the release notes.