quizlet/oauth2-php — pull request #12 by thomseddon (2012-02-12 22:31:17+00:00)
Title: Fix getClientCredentials when no client_secret sent

client_secret doesn't have to be provided to gain an access token.

Prior to this fix the script would throw undefined offset errors with no client_secret when using GET or POST, this commit just gives it null if not set.