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When using ``get_or_create`` with ``prefetch`` the behaviour was inconsistent -
it worked as expected when the row already existed, but prefetch wasn't working
if the row was being created. This now works as expected:
.. code-block:: python
>>> band = Band.objects(Band.manager).get_or_create(
... (Band.name == "New Band 2") & (Band.manager == 1)
... )
>>> band.manager
<Manager: 1>
>>> band.manager.name
"Mr Manager"
Thanks to backwardspy for reporting this issue.
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