* GetFeeds must always discard actions with dangling repo_id
See https://discourse.gitea.io/t/blank-page-after-login/5051/12
for a panic in 1.16.6.
* add comment to explain the dangling ID in the fixture
* loadRepoOwner must not attempt to use a nil action.Repo
* make fmt
Co-authored-by: Loïc Dachary <loic@dachary.org>