* Order the received queryset if it doesn't have ordering.
* Do not order UserStory model by "ref" because the query:
`queryset.filter(Q(project__gt=1) | Q(order__gt=2) | Q(ref__gt=26))`
give the wrong result. We need to use the query:
`queryset.filter(Q(project__gt=1) | Q(order__gt=2))`
because in SQL there's no short-circuiting.
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