SSO Client does not work with non-ascii hostnames

[Roman Yepishev]

Ubuntu One cannot be installed on Windows where machine name is not ascii.
When such attempt is made, the installer shows a single "ascii" error message at the bottom of the screen:

http://ubuntuone.com/5GVNCmdGQ1N7SsodoEKzv2

sso-client.log:
2011-10-16 00:06:42,250:250.0 - ubuntu_sso.main.windows - INFO - Performing login_email_password as a remote call.
2011-10-16 00:06:42,250:250.999927521 - ubuntu_sso.credentials - INFO - _login_or_register: login_only=True <email address hidden>'.
2011-10-16 00:06:42,253:253.000020981 - ubuntu_sso.credentials - INFO - find_credentials: self.app_name u'Ubuntu One', result is {}? True
2011-10-16 00:06:42,253:253.999948502 - ubuntu_sso.account - INFO - Created a new SSO access layer for service url 'https://login.ubuntu.com/api/1.0'
2011-10-16 00:06:42,257:257.999897003 - ubuntu_sso.main.windows - ERROR - CredentialsManagement: emitting CredentialsError with app_name "Ubuntu One" and error_dict {'errtype': 'UnicodeDecodeError', 'message': 'ascii'}.
2011-10-16 00:06:42,266:266.000032425 - ubuntu_sso.main.windows - INFO - Emitting remote signal for on_credentials_error with callback <ubuntuone.platform.credentials.windows.RemovableSignal object at 0x02A12D30>.
2011-10-16 00:06:42,266:266.000032425 - ubuntu_sso.controllers - ERROR - Got error when login Ubuntu One, error: {'errtype': 'UnicodeDecodeError', 'message': 'ascii'}

STR:
1. Name the computer Привет-ПК (Hello-PC in English)
2. Try to install Ubuntu One and register with your account

Exected results:
It works.

Actual results:
See picture (ascii)