Token Service might return non-JSON result

[hjacobs]

I often encounter errors on taupage startup, during the phase "push-taupage-yaml". This blocks the whole startup process
Jun 9 15:17:40 ip-172-31-169-18 berry: INFO: Rotated user credentials for myapp
Jun 9 15:17:40 ip-172-31-169-18 berry: INFO: Rotated client credentials for myapp
Jun 9 15:17:40 ip-172-31-169-18 kernel: [ 15.298998] init: plymouth-upstart-bridge main process ended, respawning
Jun 9 15:17:41 ip-172-31-169-18 taupage-init: Traceback (most recent call last):
Jun 9 15:17:41 ip-172-31-169-18 taupage-init: File "./init.d/01-push-taupage-yaml.py", line 54, in
Jun 9 15:17:41 ip-172-31-169-18 taupage-init: main()
Jun 9 15:17:41 ip-172-31-169-18 taupage-init: File "./init.d/01-push-taupage-yaml.py", line 20, in main
Jun 9 15:17:41 ip-172-31-169-18 taupage-init: token = get_to
ken(config, 'taupage', ['uid']) or {}
Jun 9 15:17:41 ip-172-31-169-18 taupage-init: File "/usr/local/lib/python3.4/dist-packages/taupage/init.py", line
87, in get_token
Jun 9 15:17:41 ip-172-31-169-18 taupage-init: token = zign.api.get_named_token(scopes, 'services', token_name, user,
passwd, url=token_url, use_keyring=False)
Jun 9 15:17:41 ip-172-31-169-18 taupage-init: File "/usr/local/lib/python3.4/dist-packages/zign/api.py", line 81, in g
et_named_token
Jun 9 15:17:41 ip-172-31-169-18 taupage-init: result = get_new_token(realm, scope, user, password, url=url, insecure
=insecure)
Jun 9 15:17:41 ip-172-31-169-18 taupage-init: File "/usr/local/lib/python3.4/dist-packages/zign/api.py", line 34, in g
et_new_token
Jun 9 15:17:41 ip-172-31-169-18 taupage-init: return response.json()
Jun 9 15:17:41 ip-172-31-169-18 taupage-init: File "/usr/lib/python3/dist-packages/requests/models.py", line 741, in j
son
Jun 9 15:17:41 ip-172-31-169-18 taupage-init: return json.loads(self.text, **kwargs)
Jun 9 15:17:41 ip-172-31-169-18 taupage-init: File "/usr/lib/python3.4/json/init.py", line 318, in loads
Jun 9 15:17:41 ip-172-31-169-18 taupage-init: return _default_decoder.decode(s)
Jun 9 15:17:41 ip-172-31-169-18 taupage-init: File "/usr/lib/python3.4/json/decoder.py", line 343, in decode
Jun 9 15:17:41 ip-172-31-169-18 taupage-init: obj, end = self.raw_decode(s, idx=_w(s, 0).end())
Jun 9 15:17:41 ip-172-31-169-18 taupage-init: File "/usr/lib/python3.4/json/decoder.py", line 361, in raw_decode
Jun 9 15:17:41 ip-172-31-169-18 taupage-init: raise ValueError(errmsg("Expecting value", s, err.value)) from None
Jun 9 15:17:41 ip-172-31-169-18 taupage-init: ValueError: Expecting value: line 1 column 1 (char 0)
Jun 9 15:17:41 ip-172-31-169-18 taupage-init: Failed to start 01-push-taupage-yaml.py