Provider is nil if oidc unresolvable

[Cyb3rDudu]

ocis/ocis-pkg/middleware/openidconnect.go

Line 76 in e0c94f6

oidcProvider = provider

needs graceful exit if provider still nil.

Reproducible by using docker and ufw firewall. Reasons not exactly clear.
Docker container is not able to resolve own domain due to firewall mess-up.

[rhafer]

This has been fixed a while ago (part of #877) in the proxy middleware. The oidc middleware in ocis-pkg does not exist anymore.