landscape-config crashes if there is more than one tag, can't register computer

Trunk revision 725

# cat /etc/landscape/client.conf
[client]
ping_url = http://staging.landscape.canonical.com/ping
url = https://staging.landscape.canonical.com/message-system
# hi andreas
tags = check,linode,package-profile-test
computer_title = ls3-precise
registration_key = some-secret
include_manager_plugins = ScriptExecution
script_users = ALL
account_name = landscape-devel

# landscape-config
(...)
Script users [ALL]:

You may provide tags for this computer e.g. server,precise.

Tags [['check', 'linode', 'package-profile-test']]:
'list' object has no attribute 'split'
Aborting Landscape configuration
root@ls3-precise:~#

And you get this in the broker log if you tried landscape-config --silent:
2013-09-20 17:45:08,383 ERROR [MainThread] Error running event handler landscape.broker.registration.RegistrationHandler._handle_pre_exchange() for event type 'pre-exchange' with args () {}.
Traceback (most recent call last):
  File "/usr/lib/python2.7/dist-packages/landscape/reactor.py", line 92, in fire
    results.append(handler(*args, **kwargs))
  File "/usr/lib/python2.7/dist-packages/landscape/broker/registration.py", line 261, in _handle_pre_exchange
    if not is_valid_tag_list(tags):
  File "/usr/lib/python2.7/dist-packages/landscape/lib/tag.py", line 17, in is_valid_tag_list
    tags = [tag.strip() for tag in tag_list.split(",")]
AttributeError: 'list' object has no attribute 'split'