Include backend argument when instantiating Celery
Include backend argument when instantiating Celery

Not including the backend argument can lead to AttributeError:
DisabledBackend object has no attribute for '_get_task_meta_for'.

See e.g.
http://stackoverflow.com/questions/23215311/celery-with-rabbitmq-attributeerror-disabledbackend-object-has-no-attribute.

At the same time, including the backend argument doesn't seem to harm anything else.

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