[FIX] auth_oauth: missing field body in formview

The body is the field used to actually display the 'log in with ...'
As not shown in the view, when adding a new provider, this field was empty and therefore wasnt visible on the login form...
[FIX] warning: make blocking warning actually doing something (opw 607380)

Instead of raising an exception (which only interupt the call of the onchange methods), return a dictionnary to set the forbidden partner or product to an empty value.
The call is not blocking in a way it forbid to create a record that uses this partner/product but it make it not possible to select it through the web interface.
[FIX] warning: make blocking warning actually doing something (opw 607380)

Instead of raising an exception (which only interupt the call of the onchange methods), return a dictionnary to set the forbidden partner or product to an empty value.
The call is not blocking in a way to forbid creating a record that uses this partner/product but it is not possible to select it through the web interface.