Extended test with case of saveing model with blank not null field.
Charfied from_native method returns default instead of None. Updated tests.
In case of None value returns empty string instead of NoneType.
Fixed test.
Always use specified content type in APIRequestFactory

If `content_type` is specified in the `APIRequestFactory`, always
include it in the request, even if data is empty.
Merge pull request #1608 from dbrgn/test_client_contenttype

Always use specified content type in APIRequestFactory
Fix typo in docs
Merge pull request #1612 from rhcarvalho/patch-3

Fix typo in docs
Replace ChoiceField type_label
Merge pull request #1619 from khamaileon/master

Replace ChoiceField type_label
Fixed #1624 (thanks @abraithwaite)
Fix #1614 - Corrected reference to serializers.CharField
Merge pull request #1632 from fletchowns/master

Fix #1614 - Corrected reference to serializers.CharField
Version 2.3.14
Fix accidental docs change
Merge pull request #1640 from tomchristie/escape-login-logout-paths

Version 2.3.14
typo in the docs
Merge pull request #1645 from tankorsmash/patch-1

tiny typo in the docstring
Fixes #1651. Add link to drf-extensions nested routers to docs
Merge pull request #1661 from chibisov/master

Fixes #1651. Add link to drf-extensions nested routers to docs