Allow responses to work with only an idp_cert_multi setting #402
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When the settings only contain an idp_cert_multi fingerprint the
responses cannot be validated because it is wrongly assumes that the
certificate cannot be checked.
Include the idp_cert_multi setting in this check as well.
It may be helpful to move this check into settings, e.g. by providing a settings.has_idp_cert? method but I have not done so yet at this point.