Bug 242647

Using git-webkit pr via SSH does not work.

```
No valid authentication session for Radar
'main' is not a pull request branch, enter issue URL or title of new issue: https://bugs.webkit.org/show_bug.cgi?id=242599
Traceback (most recent call last):
  File "/Users/yusukesuzuki/dev/OpenSource/Tools/Scripts/libraries/autoinstalled/python-3-arm64/keyring/backends/macOS/__init__.py", line 49, in get_password
    return api.find_generic_password(self.keychain, service, username)
  File "/Users/yusukesuzuki/dev/OpenSource/Tools/Scripts/libraries/autoinstalled/python-3-arm64/keyring/backends/macOS/api.py", line 144, in find_generic_password
    Error.raise_for_status(status)
  File "/Users/yusukesuzuki/dev/OpenSource/Tools/Scripts/libraries/autoinstalled/python-3-arm64/keyring/backends/macOS/api.py", line 114, in raise_for_status
    raise cls(status, "Unknown Error")
keyring.backends.macOS.api.Error: (-25308, 'Unknown Error')

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/Users/yusukesuzuki/dev/Internal/Tools/Scripts//git-webkit", line 89, in <module>
    sys.exit(program.main(
  File "/Users/yusukesuzuki/dev/OpenSource/Tools/Scripts/libraries/webkitscmpy/webkitscmpy/program/__init__.py", line 148, in main
    return parsed.main(
  File "/Users/yusukesuzuki/dev/OpenSource/Tools/Scripts/libraries/webkitscmpy/webkitscmpy/program/pull_request.py", line 456, in main
    branch_point = cls.pull_request_branch_point(repository, args, **kwargs)
  File "/Users/yusukesuzuki/dev/OpenSource/Tools/Scripts/libraries/webkitscmpy/webkitscmpy/program/pull_request.py", line 179, in pull_request_branch_point
    if Branch.main(
  File "/Users/yusukesuzuki/dev/OpenSource/Tools/Scripts/libraries/webkitscmpy/webkitscmpy/program/branch.py", line 114, in main
    if issue and issue.title and not redact and not issue.redacted:
  File "/Users/yusukesuzuki/dev/OpenSource/Tools/Scripts/libraries/webkitbugspy/webkitbugspy/issue.py", line 89, in title
    self.tracker.populate(self, 'title')
  File "/Users/yusukesuzuki/dev/OpenSource/Tools/Scripts/libraries/webkitbugspy/webkitbugspy/bugzilla.py", line 160, in populate
    response = requests.get('{}/rest/bug/{}{}'.format(self.url, issue.id, self._login_arguments(required=False)))
  File "/Users/yusukesuzuki/dev/OpenSource/Tools/Scripts/libraries/webkitbugspy/webkitbugspy/bugzilla.py", line 138, in _login_arguments
    username, password = self.credentials(required=required)
  File "/Users/yusukesuzuki/dev/OpenSource/Tools/Scripts/libraries/webkitbugspy/webkitbugspy/bugzilla.py", line 124, in credentials
    return webkitcorepy.credentials(
  File "/Users/yusukesuzuki/dev/OpenSource/Tools/Scripts/libraries/webkitcorepy/webkitcorepy/credentials.py", line 71, in credentials
    username = keyring.get_password(url, 'username')
  File "/Users/yusukesuzuki/dev/OpenSource/Tools/Scripts/libraries/autoinstalled/python-3-arm64/keyring/core.py", line 55, in get_password
    return get_keyring().get_password(service_name, username)
  File "/Users/yusukesuzuki/dev/OpenSource/Tools/Scripts/libraries/autoinstalled/python-3-arm64/keyring/backends/macOS/__init__.py", line 55, in get_password
    raise KeyringError("Can't get password from keychain: " "{}".format(e))
keyring.errors.KeyringError: Can't get password from keychain: (-25308, 'Unknown Error')
```