BugFix: Login with non existing user

views.py

             return redirect(request.GET.get('next') or '/')
         else:
             username = form.cleaned_data.get('username')
-            user = User.objects.get(username=username)
-            if user.is_active:
+            try:
+                user = User.objects.get(username=username)
+            except User.DoesNotExist:
+                is_active = True
+            else:
+                is_active = user.is_active
+            if is_active:
                 if parameter.get(parameter.USERS_SELF_REGISTRATION):
                     messages.error(request, _('Login failed! You can do a password recorvery <a href="%(url_recover)s">here</a> or you can register <a href="%(url_register)s">here</a>.') %
                                    {'url_register': users.url_register(request), 'url_recover': users.url_password_recovery(request)})