Fix some other tests broken by the new HttpError implementation
diff --git a/tests/test_json_model.py b/tests/test_json_model.py
index 5ce9b63..c9c9b7d 100644
--- a/tests/test_json_model.py
+++ b/tests/test_json_model.py
@@ -114,7 +114,7 @@
     model = JsonModel()
     resp = httplib2.Response({'status': '401'})
     resp.reason = 'Unauthorized'
-    content = '{"error": "not authorized"}'
+    content = '{"error": {"message": "not authorized"}}'
 
     try:
       content = model.response(resp, content)