Fix `/v1/repo-info?repo=foo%bar` to return a 204 status code when given repo can't be found
requested to merge feature/1948-fix-repo-info-api-endpoint-returning-200-with-no-content into develop
Fix /v1/repo-info?repo=foo%bar
to return a 204 status code when given repo can't be found
Previously the 200 and no content, caused JSON parsing on the frontend to fail
Closes https://gitlab.com/gitlab-org/gitter/webapp/issues/1948
Edited by Eric Eastwood