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>