Fix stack level too deep when model does not have attributes method.
Without that patch when using ActiveModel::AttributeMethods in a class that does not respond to `attributes` method, stack level too deep error will be raised on non existing method. While documentation is clear that you need to define `attributes` method in order to use AttributeMethods module, `stack level too deep` is rather obscure and hard to debug, therefore we should try to not break `method_missing` if someone forgets about defining `attributes`.
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