note button.Not authorized handle

exposition/views.py

@@ -400,6 +400,8 @@ class ExpoMembers(ListView):
 def add_note(request, slug):
     args = {'success': False}
 
+    if request.user.is_authenticated():
+
         if request.GET:
             text = request.GET['note_text']
             try:
@@ -421,4 +423,8 @@ def add_note(request, slug):
             args['success'] = True
             args['text'] = text
 
+    else:
+        args['not_authorized'] = True
+        args['success'] = True
+
     return HttpResponse(json.dumps(args), content_type='application/json')