Handling of panels in default search

[Jakob37]

Conversation from #4832

Jakob37: A minor detail is the [''] appearing up to the right. This is the same for the transcript outliers page.

dnil: Good point with the empty panels indicator. It is not super consistent. But when e.g. searching a case without a set of default panels it will go to "All" which kind of makes sense, but then not revert to none when searching only explicitly a few genes. That is not perfect, and has been the case for a long time. Let's make an issue for it and fix on a quality-of-life prio.