In AuthCallback catch all kind of errors returned by the backend

In AuthCallback, we catch the errors in key error of the redirect_uri, but it can also be error_code or error_description with no state returned, we should prevent the success callback to execute if the right information are not provided. (And display and error screen to help debugging : Cf. https://gitlab.com/Misakey/app-frontend/merge_requests/103#note_221679667)