Thank you, Yarik

Wow, @yarikoptic, you found a good one!

First, the workaround: if you perform either of those searches again (by Dandiset ID, or by author's last name), then click on the settings gear to the left of the search bar and turn on "Empty Dandisets", can you confirm that the appropriate search results now show up?

Second, the explanation: Dandiset 121 is somewhat odd in that it has published versions (which, by necessity, are not empty), but also a draft version whose assets have all been deleted. The logic for checking for empty Dandisets has a bug in it: it looks only at the oldest version of a Dandiset, and checks that for assets. The oldest version in every Dandiset is the draft version (the draft version is created as soon as the Dandiset is created, and all published versions are necessarily created later). So, in the case of 000121, even though it has published versions (and therefore is not empty), the logic notices that the draft version is empty, and reports the whole Dandiset as being so.

Finally, a bigger picture note: even though fixing the bug described above would correctly show Dandiset 121 when searching for 000121, truly empty Dandisets still will not show up when searching for their IDs. This is because, as demonstrated in the workaround above, the search results are subject to the user's local Dandiset listing display settings. I don't believe this should be the case: when you perform a search, you are looking directly for all Dandisets, regardless of draft-only or empty status, that meet your search term criteria. Therefore, I believe searches should not filter themselves based on those settings; those settings are specifically for the public Dandiset listing, not search. Thoughts on this?

My plan here is as follows:

1. Fix the bad empty Dandiset detection logic. That will immediately fix the problem with 000121.
2. Determine a consensus on whether searches in general should ignore the user's Dandiset listing settings; if we decide that they should, I will attempt a fix to make it so.

(thanks @jjnesbitt for your help in diagnosing this)

yikes, that is a fun one -- I am not sure how I was that lucky! Thanks for troubleshooting to its surrender! I am confirming that selecting "Empty Datasets" shows it right away.

I think there could be yet another solution for search:

• in case of "No results" (only, or in general somehow), somewhat similarly to what kayak (and other sites do I think)

So, to suggest to remove filters, and potentially state how many hits then there would be, like in this case could have been

No results! If you reset filters in ⚙️ you would see filtered out 1 result

in case of "No results" (only, or in general somehow), somewhat similarly to what kayak (and other sites do I think)

In user interface design, these are known as "empty states" (here's a nice website that catalogs a bunch in the wild: https://emptystat.es/).

I've opened #2033 to track this.