The get_value method of ListField seems to use if len(val) > 1: where I believe it ought to be if len(val) >= 1: or if len(val) > 0:

In a Django QueryDict, for example, getlist will yield a list of 1 item even if there is only one item. This seems to miss all the paths currently defined.

By way of example, here's a quick sketch of what I believe is demonstrable of the issue I think we're having:

>>> from rest_framework.fields import ListField
>>> from django.http import QueryDict
>>> qs = QueryDict('foo=1')
[u'1']
>>> qs2 = QueryDict('foo=1&foo=2')
[u'1', u'2']
>>> field = ListField()
>>> field.field_name = 'foo'  # for the purposes of getting the prefix right
>>> field.get_value(qs2)
[u'1', u'2']
>>> field.get_value(qs)
[]

I'd expect the last, empty list [] to be [u'1']
This is against drf 3.2.0 and Django 1.8.x