Document allow_empty argument (#4117)
Document allow_empty argument (#4117)

ListSerializer fields or serializers that are passed many=True may also take an allow_empty=False argument to disallow empty lists as valid input.

Information about this was part of the 3.2 release announcement, but had not been part of the API docs until now.
pombredanne/django-rest-framework,dmwyatt/django-rest-framework,werthen/django-rest-framework,ossanna16/django-rest-framework,pombredanne/django-rest-framework,uploadcare/django-rest-framework,ossanna16/django-rest-framework,johnraz/django-rest-framework,dmwyatt/django-rest-framework,davesque/django-rest-framework,kgeorgy/django-rest-framework,davesque/django-rest-framework,jpadilla/django-rest-framework,atombrella/django-rest-framework,johnraz/django-rest-framework,linovia/django-rest-framework,edx/django-rest-framework,werthen/django-rest-framework,linovia/django-rest-framework,linovia/django-rest-framework,edx/django-rest-framework,johnraz/django-rest-framework,tomchristie/django-rest-framework,dmwyatt/django-rest-framework,uploadcare/django-rest-framework,davesque/django-rest-framework,kgeorgy/django-rest-framework,jpadilla/django-rest-framework,ossanna16/django-rest-framework,tomchristie/django-rest-framework,edx/django-rest-framework,atombrella/django-rest-framework,kgeorgy/django-rest-framework,tomchristie/django-rest-framework,pombredanne/django-rest-framework,jpadilla/django-rest-framework,atombrella/django-rest-framework,werthen/django-rest-framework,uploadcare/django-rest-framework