bug#34636: "guix refresh" fails

[Andreas Enge <andreas@enge.fr>]

Hello,

when I run
   guix refresh
(with the latest git commit), the result is an error:

Backtrace:
          13 (apply-smob/1 #<catch-closure 1a60ca0>)
In ice-9/boot-9.scm:
    705:2 12 (call-with-prompt _ _ #<procedure default-prompt-handle…>)
In ice-9/eval.scm:
    619:8 11 (_ #(#(#<directory (guile-user) 1ae7140>)))
In guix/ui.scm:
  1654:12 10 (run-guix-command _ . _)
In ice-9/boot-9.scm:
    829:9  9 (catch _ _ #<procedure 7efd4f7cb9b8 at guix/ui.scm:624…> …)
    829:9  8 (catch _ _ #<procedure 7efd4f7cb9d0 at guix/ui.scm:750…> …)
In guix/scripts/refresh.scm:
    513:8  7 (_)
In guix/store.scm:
  1737:24  6 (run-with-store _ _ #:guile-for-build _ #:system _ # _)
In guix/scripts/refresh.scm:
   538:14  5 (_ _)
In srfi/srfi-1.scm:
    640:9  4 (for-each #<procedure 44354c0 at guix/scripts/refresh.…> …)
In guix/scripts/refresh.scm:
    346:2  3 (check-for-package-update #<package footswitch@0.1-2.c…> …)
In guix/import/github.scm:
   226:25  2 (latest-release #<package footswitch@0.1-2.ca43d53 gnu/…>)
    209:9  1 (latest-released-version _ _)
In unknown file:
           0 (remove #<procedure pre-release? (x)> #((("body" . #) …)))

ERROR: In procedure remove:
In procedure remove: Wrong type argument in position 2: #((("body" . "") ("zipball_url" . "https://api.github.com/repos/rgerganov/footswitch/zipball/v1.0") ("tarball_url" . "https://api.github.com/repos/rgerganov/footswitch/tarball/v1.0") ("assets" . #()) ("published_at" . "2019-01-07T07:28:36Z") ("created_at" . "2018-10-09T14:33:23Z") ("prerelease" . #f) ("author" ("site_admin" . #f) ("type" . "User") ("received_events_url" . "https://api.github.com/users/rgerganov/received_events") ("events_url" . "https://api.github.com/users/rgerganov/events{/privacy}") ("repos_url" . "https://api.github.com/users/rgerganov/repos") ("organizations_url" . "https://api.github.com/users/rgerganov/orgs") ("subscriptions_url" . "https://api.github.com/users/rgerganov/subscriptions") ("starred_url" . "https://api.github.com/users/rgerganov/starred{/owner}{/repo}") ("gists_url" . "https://api.github.com/users/rgerganov/gists{/gist_id}") ("following_url" . "https://api.github.com/users/rgerganov/following{/other_user}") ("followers_url" . "https://api.github.com/users/rgerganov/followers") ("html_url" . "https://github.com/rgerganov") ("url" . "https://api.github.com/users/rgerganov") ("gravatar_id" . "") ("avatar_url" . "https://avatars2.githubusercontent.com/u/271616?v=4") ("node_id" . "MDQ6VXNlcjI3MTYxNg==") ("id" . 271616) ("login" . "rgerganov")) ("draft" . #f) ("name" . "First public release") ("target_commitish" . "master") ("tag_name" . "v1.0") ("node_id" . "MDc6UmVsZWFzZTE0ODI3Njk2") ("id" . 14827696) ("html_url" . "https://github.com/rgerganov/footswitch/releases/tag/v1.0") ("upload_url" . "https://uploads.github.com/repos/rgerganov/footswitch/releases/14827696/assets{?name,label}") ("assets_url" . "https://api.github.com/repos/rgerganov/footswitch/releases/14827696/assets") ("url" . "https://api.github.com/repos/rgerganov/footswitch/releases/14827696")))

This may simply be a problem with the footswitch package, or an emanation
of a more general problem with the github updater.

Andreas