fix(web/panettone): Dont double up on borders

Don't render the <ol class="issue-history"> when we have nothing to put
in it, which is the case when there's no issue history and the user is
not logged in. This avoids an awkward-looking double bottom border on
issues with no comments for unauthenticated users.

Change-Id: I1c6aac40e4ba93e9428a0da589c67582b1589c17
Reviewed-on: https://cl.tvl.fyi/c/depot/+/5445
Autosubmit: grfn <grfn@gws.fyi>
Tested-by: BuildkiteCI
Reviewed-by: tazjin <tazjin@tvl.su>

web/panettone/src/panettone.lisp

@@ -391,13 +391,14 @@
                               #'local-time:timestamp<
                               :key #'created-at)))
          (markdownify-comment-bodies comments)
+         (when (or history *user*)
            (who:htm
             (:ol
              :class "issue-history"
              (dolist (item history)
                (render/issue-history-item item))
              (when *user*
-             (render/new-comment (id issue))))))))))
+               (render/new-comment (id issue)))))))))))
 
 (defun render/not-found (entity-type)
   (render ()