Moving all OAuth code and samples to use Storage consistently
diff --git a/samples/oauth2/buzz/buzz.py b/samples/oauth2/buzz/buzz.py
index fe30a32..a009517 100644
--- a/samples/oauth2/buzz/buzz.py
+++ b/samples/oauth2/buzz/buzz.py
@@ -27,7 +27,7 @@
def main():
storage = Storage('buzz.dat')
credentials = storage.get()
- if not credentials:
+ if credentials is None or credentials.invalid == True:
flow = OAuth2WebServerFlow(
client_id='433807057907.apps.googleusercontent.com',
client_secret='jigtZpMApkRxncxikFpR+SFg',