Doing `act --local-repository test/self-ref@main=/folder-path/self-ref` caused a null pointer exception while fetching a non mapped entry, due to missing remote fallback.
Reviewed-on: https://gitea.com/actions-oss/act-cli/pulls/29
Co-authored-by: Christopher Homberger <christopher.homberger@web.de>
Co-committed-by: Christopher Homberger <christopher.homberger@web.de>