Jonathan Barratt 0610a6645d Fix QueueMembership bug revealed by django.test's DiscoverRunner
If HELPDESK_ENABLE_PER_QUEUE_STAFF_MEMBERSHIP was True but a user had
no QueueMembership entries, then restricting queue access generated
RelatedObjectDoesNotExist exceptions.

 - Ask for forgiveness whenever we try to limit a queryset by the
queuemembership related object set.

 - Since tests can now be run with the project's settings active,
rather than only with quicktest.py's settings, restore the initial
HELPDESK_ENABLE_PER_QUEUE_MEMBERSHIP value after having tested the
related functionality.
2015-11-16 18:45:27 +07:00
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