LGTM

Even with the query limit, using a server.listRPMs() call as a boolean flag raises a red flag. Maybe ok, can can we check how much time this takes on some live servers?
Also, archives can have other archives (not just rpms) as components now.

It is not that slow - hard to decide what is sustainable limit here (do we've have some statistic of this page displays from some production env?)

Other option would be to display link everytime even if it is leading to empty list, so calls are executed only on component list page.

The rootid check only works for btype=image. Fix here:
https://github.com/mikem23/koji-playground/commits/pagure/pr/610

Patch added.

Commit bc02f03d fixes this pull-request