TE: sound auto-detection adds sound "-1" if empty sound source is found on the map

[Joey79100]

I have a sound source on my test map, which happens to be empty (no idea why it's there, probably an error from my part):

I made a few changes to my sound catalogs, so I pressed autodetect. And I noticed a sound entry adding itself. This is what you can see if you press "Deselect all" first, then "From sound sources":

After testing, I found it was because of this empty sound source.

I have not tried rebuilding the level this way, I just removed the sound source and carried on.