use QuerySet in all managers

pandora/edit/managers.py

@@ -2,6 +2,8 @@
 # vi:si:et:sw=4:sts=4:ts=4
 from django.db.models import Q, Manager
 
+from ox.django.query import QuerySet
+
 
 def parseCondition(condition, user):
     '''
@@ -92,7 +94,7 @@ def parseConditions(conditions, operator, user):
 class EditManager(Manager):
 
     def get_query_set(self):
-        return super(EditManager, self).get_query_set()
+        return QuerySet(self.model)
 
     def find(self, data, user):
         '''

pandora/edit/views.py

@@ -172,7 +172,7 @@ def _order_clips(qs, sort):
         order = '%s%s' % (operator, key)
         order_by.append(order)
     if order_by:
-        qs = qs.order_by(*order_by)
+        qs = qs.order_by(*order_by, nulls_last=True)
     qs = qs.distinct()
     return qs