When the location is just a videoconferencing URL, don't duplicate that field row for the "Join" button in the event details popover
In recent versions of GNOME Calendar, as seen in issue #723 (closed) and #712 (closed), not only do hyperlinks in the location field work, but if they are recognized as an obvious videoconferencing link, the UI shows a big "Join" button for it.
To do so, it creates an extra row, which makes sense when the link is parsed from the description field (when it works; see also issue #1136) or when there is more than just the link in the location field... however, when there is only the link's string in the location field (or description field), this is wasteful, as information is just duplicated for no good reason. It wastes space and looks/feels like an afterthought: