can't execute /core-services=management/access=authorization:... in managed domain

[Ladicek]

Creaper always prepends /host=... to addresses beginning with /core-service=... in managed domain. That, however, is wrong, there are legitimate uses of /core-service=... addresses in managed domain (e.g. RBAC).

Currently, if there's no default host set, attempting to execute operation on a /core-service=... address will end up with an exception. The solution of this problem will relax this check -- if there's no default host, just execute the operation without changes.

Thanks to @cypo721 for discovering the issue!