skip jobs with no builds

lib/builder_web.ml

@@ -280,6 +280,9 @@ let routes ~datadir ~cachedir ~configdir =
              Log.warn (fun m -> m "Job without builds: %s" job_name);
              Lwt_result.return acc)
            ps (Lwt_result.return []) >>= fun platform_builds ->
+         if platform_builds = [] then
+           Lwt_result.return acc
+         else
            let v = (job_name, synopsis, platform_builds) in
            let section = Option.value ~default:"Uncategorized" section in
            Lwt_result.return (Utils.String_map.add_or_create section v acc))