[idp saml2] only set signature_verify_hint when a service provider is found
[idp saml2] only set signature_verify_hint when a service provider is found

adieu/authentic2,incuna/authentic,adieu/authentic2,pu239ppy/authentic2,incuna/authentic,incuna/authentic,adieu/authentic2,BryceLohr/authentic,pu239ppy/authentic2,pu239ppy/authentic2,BryceLohr/authentic,pu239ppy/authentic2,BryceLohr/authentic,incuna/authentic,incuna/authentic,adieu/authentic2,BryceLohr/authentic