Prompt for login for approving slide suggestions instead of just pres…

…enting an error. Fixes #2750. Commit ready for merge.

 - Legacy-Id: 16561

ietf/meeting/views.py

@@ -2425,7 +2425,8 @@ def __init__(self, show_apply_to_all_checkbox, *args, **kwargs):
         super(ApproveSlidesForm, self).__init__(*args, **kwargs )
         if not show_apply_to_all_checkbox:
             self.fields.pop('apply_to_all')
-
+
+@login_required
 def approve_proposed_slides(request, slidesubmission_id, num):
     submission = get_object_or_404(SlideSubmission,pk=slidesubmission_id)
     if not submission.session.can_manage_materials(request.user):