Report missing credentials to the Rails application. #1
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If no username or password is provided a MissingCredentialsError is
raised which causes a Rack caught exception and a 500 Error in gitlab.
Omniauth provides a way to raise such errors to the application by
using the 'fail!' method to pass the exception to the registered
failure handler. For gitlab this is the omniauth_controller code.
This is required to resolve gitlab issue #1077.
Signed-off-by: Pat Thoyts [email protected]