title: Django braces - login and group required
body: <p>Starting with the following view:</p>
  
  <pre><code>from braces.views import GroupRequiredMixin, LoginRequiredMixin
  
  class AddAttributeView(LoginRequiredMixin, GroupRequiredMixin, FormView):
      group_required = "SchemaAdmin"
      ...
  </code></pre>
  
  <p>I want to achieve the following:</p>
  
  <ol>
  <li>If the user is not logged in -> redirect the user to login page</li>
  <li>If the user is logged in and has no permissions: throw 403</li>
  </ol>
  
  <p>With the configuration above, the user is always redirected to the login page (even if he is logged in but simply not in the group)</p>
  
  <p>On the other hand, if I set <code>raise_exception = True</code> , the application always throws a 403 , even if the user is not logged in.</p>
  
  <p>Is there a possibility to achieve the above without setting <code>raise_exception = my_function</code> and implementing the whole logic in <code>my_function</code>?</p>