The problem here is that some error-related templates render without
the context managers that we specify, and so we want the handling of
"the context was not set" to default to the enterprise case (because
the enterprise version will work basically fine on !enterprise, but
the opposite is not true because the enterprise distribution doesn't
even have the templates for certain !enterprise pages that may be
linked to).
(imported from commit 7547311d87e048d33221587f44b82fe0ba320ca1)
This needs to be deployed to both staging and prod at the same
off-peak time (and the schema migration run).
At the time it is deployed, we need to make a few changes directly in
the database:
(1) UPDATE django_content_type set app_label='zerver' where app_label='zephyr';
(2) UPDATE south_migrationhistory set app_name='zerver' where app_name='zephyr';
(imported from commit eb3fd719571740189514ef0b884738cb30df1320)