Merge ~matiasb/snapstore-client:api-v2-errors into snapstore-client:master

[Matias Bordese]

Updated error logging for v2 responses.

[Adam Collard (adam-collard)]

+1, thanks

review: Approve

diff --git a/snapstore_client/tests/factory.py b/snapstore_client/tests/factory.py
index 4dd524d..b7f77c6 100644
--- a/snapstore_client/tests/factory.py
+++ b/snapstore_client/tests/factory.py
@@ -78,7 +78,7 @@ class APIError(Exception):
         return len(self._error_list) > 0
 
     def to_dict(self):
-        return {'error_list': [{'message': m} for m in self._error_list]}
+        return {'error-list': [{'message': m} for m in self._error_list]}
 
     @classmethod
     def single(cls, message):
diff --git a/snapstore_client/tests/test_webservices.py b/snapstore_client/tests/test_webservices.py
index 81ca041..c9c743c 100644
--- a/snapstore_client/tests/test_webservices.py
+++ b/snapstore_client/tests/test_webservices.py
@@ -116,7 +116,8 @@ class WebservicesTests(TestCase):
         discharge_url = urljoin(sso_url, '/api/v2/tokens/discharge')
         responses.add(
             'POST', discharge_url, status=400,
-            json=factory.APIError.single('Something went wrong').to_dict())
+            json={'error_list': [{'code': 'invalid-request',
+                                  'message': 'Something went wrong'}]})
 
         e = self.assertRaises(
             exceptions.StoreAuthenticationError, webservices.get_sso_discharge,
diff --git a/snapstore_client/webservices.py b/snapstore_client/webservices.py
index fb1927a..8a15fb9 100644
--- a/snapstore_client/webservices.py
+++ b/snapstore_client/webservices.py
@@ -145,7 +145,9 @@ def _print_error_message(action, response):
     else:
         try:
             json_document = response.json()
-            for error in json_document['error_list']:
+            error_list = json_document.get(
+                'error-list', json_document.get('error_list', []))
+            for error in error_list:
                 logger.error(error['message'])
         except json.JSONDecodeError:
             logger.error('=' * 20)