Undefined nonces should be equal in IdToken processing

[AdrianFarmadin]

Nonces are compared with strict equality claims.nonce !== savedNonce
If savedNonce is not defined then the default value is null.
If nonce attribute is missing on claims object, then the default value is undefined.

With strict equality this will cause an error. The savedNonce should be initialized with undefined

[wjehring]

@manfredsteyer any chance you could take a look at this please?

I'm trying to use fetchTokenUsingGrant, and since there's no way to pass a skipNonceCheck like in some other calls, it's throwing because there's no nonce in the id token.

Happy to help out if there's anything I can assist with!