UserDeniedPermissionException not thrown when a user denies access on google plus

[annorax]

Instead, a SocialAuthException is thrown from OAuth2 with the error message Verification code is null.

It's important to note that Google's way of returning from an access-denied scenario is with a request parameter of error whose value is access_denied. The code request parameter isn't returned in this case, which trips the OAuth2 thrown exception.

Stack trace:

  - org.brickred.socialauth.oauthstrategy.OAuth2.verifyResponse(OAuth2.java:148)
  - org.brickred.socialauth.provider.GooglePlusImpl.doVerifyResponse(GooglePlusImpl.java:199)
  - org.brickred.socialauth.provider.GooglePlusImpl.verifyResponse(GooglePlusImpl.java:189)
  - org.brickred.socialauth.SocialAuthManager.connect(SocialAuthManager.java:184)