Pass request to call to get_iterable in preview endpoint
Pass request to call to get_iterable in preview endpoint

This fixes the case where request-based query processors can cause
inconsistent results because get_queryset gets the request kwarg earlier
in the preview endpoint.

Signed-off-by: Don Naegely <e690a32c1e2176a2bfface09e204830e1b5491e3@gmail.com>

rv816/serrano_night,chop-dbhi/serrano,rv816/serrano_night,chop-dbhi/serrano