Login required on modals

* adds new login_required_modal decorator
    * can be used before regular login_required decorator to return a proper session-timed-out message

ema/views/share.py

@@ -9,7 +9,7 @@ from django.contrib.auth.decorators import login_required
 from django.utils.decorators import method_decorator
 
 from ema.models import Ema
-from konova.decorators import conservation_office_group_required, shared_access_required
+from konova.decorators import conservation_office_group_required, shared_access_required, login_required_modal
 from konova.views.share import AbstractShareByTokenView, AbstractShareFormView
 
 
@@ -25,6 +25,7 @@ class EmaShareByTokenView(AbstractShareByTokenView):
 class EmaShareFormView(AbstractShareFormView):
     model = Ema
 
+    @method_decorator(login_required_modal)
     @method_decorator(login_required)
     @method_decorator(conservation_office_group_required)
     @method_decorator(shared_access_required(Ema, "id"))