fix missing yield in SliverAdmin.get_form_sets
diff --git a/planetstack/core/admin.py b/planetstack/core/admin.py
index 6a8341b..3b87dc8 100644
--- a/planetstack/core/admin.py
+++ b/planetstack/core/admin.py
@@ -810,6 +810,9 @@
             # hide MyInline in the add view
             if obj is None:
                 continue
+            if isinstance(inline, SliverInline):
+                inline.model.caller = request.user
+            yield inline.get_formset(request, obj)
 
     #def save_model(self, request, obj, form, change):
     #    # update openstack connection to use this site/tenant