Fix regression with OIDC discovery url but no tokenUrl #3280
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Causing Issue #3271
Withe the change from #3165 we improved performance because the loop of OIDC providers in /login endpoint should not request always all OIDC idps.
But now if you want use a concrete OIDC idp for password grant there could be the situation, that no tokenUrl is available
This PR checks if tokenUrl is null ( which is allowed from configuration ) and then fetch OIDC metadata. If the tokenUrl still is null, then exit with an error, but not run ino NPE.