Nested ArrayField error in 1.9

Nested ArrayField seems to be broken in 1.9, it creates an error when running the system checks.

Using a nested ArrayField from the docs will cause the error in 1.9 (but works on 1.8.7):

models.py:

from django.contrib.postgres.fields import ArrayField

from django.db import models

class Board(models.Model):

    pieces = ArrayField(ArrayField(models.IntegerField()))

When running runserver on an new project with this model on 1.9 it triggers the following error:

Unhandled exception in thread started by <function wrapper at 0xb61e3844>

Traceback (most recent call last):

  File "/home/vagrant/.virtualenvs/djangotest/local/lib/python2.7/site-packages/django/utils/autoreload.py", line 226, in wrapper

    fn(*args, **kwargs)

  File "/home/vagrant/.virtualenvs/djangotest/local/lib/python2.7/site-packages/django/core/management/commands/runserver.py", line 116, in inner_run

    self.check(display_num_errors=True)

  File "/home/vagrant/.virtualenvs/djangotest/local/lib/python2.7/site-packages/django/core/management/base.py", line 426, in check

    include_deployment_checks=include_deployment_checks,

  File "/home/vagrant/.virtualenvs/djangotest/local/lib/python2.7/site-packages/django/core/checks/registry.py", line 75, in run_checks

    new_errors = check(app_configs=app_configs)

  File "/home/vagrant/.virtualenvs/djangotest/local/lib/python2.7/site-packages/django/core/checks/model_checks.py", line 28, in check_all_models

    errors.extend(model.check(**kwargs))

  File "/home/vagrant/.virtualenvs/djangotest/local/lib/python2.7/site-packages/django/db/models/base.py", line 1170, in check

    errors.extend(cls._check_fields(**kwargs))

  File "/home/vagrant/.virtualenvs/djangotest/local/lib/python2.7/site-packages/django/db/models/base.py", line 1247, in _check_fields

    errors.extend(field.check(**kwargs))

  File "/home/vagrant/.virtualenvs/djangotest/local/lib/python2.7/site-packages/django/contrib/postgres/fields/array.py", line 49, in check

    base_errors = self.base_field.check()

  File "/home/vagrant/.virtualenvs/djangotest/local/lib/python2.7/site-packages/django/contrib/postgres/fields/array.py", line 49, in check

    base_errors = self.base_field.check()

  File "/home/vagrant/.virtualenvs/djangotest/local/lib/python2.7/site-packages/django/db/models/fields/__init__.py", line 1820, in check

    errors = super(IntegerField, self).check(**kwargs)

  File "/home/vagrant/.virtualenvs/djangotest/local/lib/python2.7/site-packages/django/db/models/fields/__init__.py", line 208, in check

    errors.extend(self._check_backend_specific_checks(**kwargs))

  File "/home/vagrant/.virtualenvs/djangotest/local/lib/python2.7/site-packages/django/db/models/fields/__init__.py", line 314, in _check_backend_specific_checks

    app_label = self.model._meta.app_label

AttributeError: 'IntegerField' object has no attribute 'model'

Am I missing something? Non nested ArrayField works ok, just a nested ArrayField triggers the problem.

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