- If start_datetime is null, then the offer has no start date.
- If end_datetime is null, then the offer never expires.

Use the ActiveOfferManager in Applicator.get_site_offers instead of
reimplementing the same logic there.

Fixes #2344.

* Add note about ``get_default_shipping_method`` shipping repository method to the documentation.
* Add note how to add custom node to the dashboard navigation with non-dashboard URLconf.

Fix typo in shipping how to docs `how_to_configure_shipping.rst`.

Updated offer.custom module to load models using get_model()

This change ensures that the module can be loaded if models are customized in forked apps.

Fixes #2345

Initiate pricing strategy inside the search index class in order to make it easier to override.

Despite you cannot customize `ProductIndex` class, you may need inherit original search index class and override necessary functionality or add new fields.
Afterwards, do not forget to exclude original search index in the Haystack settings.

Fix handling of unicode formats in Oscar's date/time/datetime widgets.

Also remove some Django 1.6 compatibility code.

Fixes #2176.

Return an empty string when no value was given for a phone number instead
of None since the phonenumberfield doesn't cast none to '' anymore which
resulted in an not null sql error.

This was removed in an earlier commit (thanks solarissmoke)

The FileInput.format_value returns None instead of the passed value
in Django 1.11. Remove the usage of format_value since it was a noop
before Django 1.11 anyway

Fixes #2334

Switch to using Django's password validation framework in Django >=1.9

Remove product reviews on product removal.

Django 1.9 introduced the AUTH_PASSWORD_VALIDATORS setting which allows for
more flexible password validation. Switch to using that when it is available,
with a fallback to Oscar's previous behaviour in Django 1.8 or when this
setting is empty.

Remove the verify_exists argument from ExtendedUrlField

This was removed from the parent class way back in Django 1.4, and was
not being used at all here. It existed only for backwards compatibility.

Cleanup unused benefits and conditions after conditional offer removal.

Attempt to create media directory for MissingProductImage if it doesn't exist

Fixes #2168.

Now after ConditionalOffer deleted will be deleted related Benefits and Conditions models (through post_delete signal) if they are no longer used by other offers (with exception of custom benefits/conditions). Plus some small changes related to PEP8 and typos.

Update supported Django/Python versions and tox configuration.

- Drop support for Django 1.9 (EOL)
- Drop support for Python 3.6 with Django 1.8 to 1.10

Fix Python 3 string handling in AbstractProductAttributeValue._multi_option_as_text

Update django-redis to 4.8.0

Fix EmailBackend.authenticate() signature for Django 1.11.

Refactor product alerts to use Communication Events

Update ipdb to 0.10.3

The copying of the email address within the datamigration isn't really
optimal when a site has a large number of users and send emails.