omniauth / omniauth-oauth2 / 39718489164

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Fail instead of crashing when there's no access token

With raise_errors off in client_options, oauth2 returns nil from
get_token when the token response is empty or not a JSON object, and
the callback raised NoMethodError calling expired? on it. Fail with
invalid_credentials instead. Getting and refreshing the token moves
into fetch_access_token, which keeps callback_phase within RuboCop's
limits.

Fixes https://github.com/omniauth/omniauth-oauth2/issues/138

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