Xenial / pyudev: pyudev.device.Device.attributes['size'] fails.

...
Running migrations:
Rendering model states... DONE
Applying contenttypes.0001_initial... OK
Applying auth.0001_initial... OK
Applying admin.0001_initial... OK
Applying contenttypes.0002_remove_content_type_name... OK
Applying auth.0002_alter_permission_name_max_length... OK
Applying auth.0003_alter_user_email_max_length... OK
Applying auth.0004_alter_user_username_opts... OK
Applying auth.0005_alter_user_last_login_null... OK
Applying auth.0006_require_contenttypes_0002... OK
Applying authtoken.0001_initial... OK
Applying authtoken.0002_auto_20160226_1747... OK
Applying ifconfig.0001_initial... OK
Applying ifconfig.0002_auto_20160329_1248... OK
Applying cmdlog.0001_initial... OK
Applying cron.0001_initial... OK
Applying volumes.0001_initial... OK
Applying http.0001_initial... OK
Applying ifconfig.0003_host_is_oa_host... OK
Applying lio.0001_initial... OK
Applying nagios.0001_initial... OK
Applying nagios.0002_auto_20170126_1628... OK
Applying nfs.0001_initial... OK
Applying samba.0001_initial... OK
Applying sessions.0001_initial... OK
Applying sites.0001_initial... OK
Applying taskqueue.0001_initial... OK
Applying taskqueue.0002_taskqueue_description_textfield... OK
Applying userprefs.0001_initial... OK
/usr/share/openattic/volumes/models.py:31: RemovedInDjango19Warning: django.contrib.contenttypes.generic is deprecated and will be removed in Django 1.9. Its contents have been moved to the fields, forms, and admin submodules of django.contrib.contenttypes.
from django.contrib.contenttypes import generic

/usr/lib/python2.7/dist-packages/django/core/management/commands/loaddata.py:229: RemovedInDjango19Warning: initial_data fixtures are deprecated. Use data migrations instead.
RemovedInDjango19Warning

Installed 66 object(s) from 2 fixture(s)
/usr/share/openattic/volumes/models.py:31: RemovedInDjango19Warning: django.contrib.contenttypes.generic is deprecated and will be removed in Django 1.9. Its contents have been moved to the fields, forms, and admin submodules of django.contrib.contenttypes.
from django.contrib.contenttypes import generic

/usr/share/openattic/volumes/models.py:31: RemovedInDjango19Warning: django.contrib.contenttypes.generic is deprecated and will be removed in Django 1.9. Its contents have been moved to the fields, forms, and admin submodules of django.contrib.contenttypes.
from django.contrib.contenttypes import generic

Created default user "openattic" with password "openattic".
Waiting for /var/cache/nagios3/status.dat to appear OK
/usr/share/openattic/volumes/models.py:31: RemovedInDjango19Warning: django.contrib.contenttypes.generic is deprecated and will be removed in Django 1.9. Its contents have been moved to the fields, forms, and admin submodules of django.contrib.contenttypes.
from django.contrib.contenttypes import generic

/usr/share/openattic/sysutils/management/commands/post_install.py:19: RemovedInDjango19Warning: django.utils.importlib will be removed in Django 1.9.
from django.utils.importlib import import_module

Adding lo
Adding {'peer': '127.0.0.1', 'netmask': '255.0.0.0', 'addr': '127.0.0.1'}
Adding {'netmask': 'ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff', 'addr': '::1'}
Adding enp1s0
Adding br0
Adding {'broadcast': '10.80.255.255', 'netmask': '255.255.0.0', 'addr': '10.80.1.20'}
Adding virbr0
Adding {'broadcast': '192.168.122.255', 'netmask': '255.255.255.0', 'addr': '192.168.122.1'}
Adding virbr0-nic
Traceback (most recent call last):
File "manage.py", line 26, in <module>
execute_from_command_line(sys.argv)
File "/usr/lib/python2.7/dist-packages/django/core/management/__init__.py", line 354, in execute_from_command_line
utility.execute()
File "/usr/lib/python2.7/dist-packages/django/core/management/__init__.py", line 346, in execute
self.fetch_command(subcommand).run_from_argv(self.argv)
File "/usr/lib/python2.7/dist-packages/django/core/management/base.py", line 394, in run_from_argv
self.execute(*args, **cmd_options)
File "/usr/lib/python2.7/dist-packages/django/core/management/base.py", line 445, in execute
output = self.handle(*args, **options)
File "/usr/share/openattic/sysutils/management/commands/post_install.py", line 49, in handle
sysutils.models.post_install.send(sender=sysutils.models)
File "/usr/lib/python2.7/dist-packages/django/dispatch/dispatcher.py", line 189, in send
response = receiver(signal=self, sender=sender, **named)
File "/usr/share/openattic/volumes/management/__init__.py", line 51, in update_disks
if int(dev.attributes["size"].strip("\0")) == 0:
TypeError: 'Attributes' object has no attribute '__getitem__'

$ lsblk
NAME             MAJ:MIN RM   SIZE RO TYPE MOUNTPOINT
sr0               11:0    1  1024M  0 rom  
sda                8:0    0 111,8G  0 disk 
├─sda2             8:2    0   300M  0 part /boot
├─sda3             8:3    0 111,4G  0 part 
│ ├─mmwork-home  253:1    0    55G  0 lvm  /home
│ ├─mmwork-ubu12 253:2    0    17G  0 lvm  /
│ ├─mmwork-swap  253:0    0   4,4G  0 lvm  [SWAP]
│ └─mmwork-qwe   253:3    0    35G  0 lvm  
└─sda1             8:1    0   100M  0 part /boot/efi