A store without BIEBs cannot have its team modified.
Summary
While editing the store https://foodsharing.de/?page=fsbetrieb&id=14130 as BOT I noticed the only team member left was a non-BIEB. Trying to edit the team I could add myself but not save the changes due to the lack of BIEB, which I could not assign to myself since only already existing team members can be assigned as BIEB.
I managed to remove the final member through the left column's member list though, so now the store is truly empty.
Steps to reproduce
I'm not sure how to get a store without active BIEB, maybe the former BIEB deleted their account or the only member got downgraded to Foodsaver for some reason.
What is the current bug behavior?
Trying to add a new member and make them the store's manager is not possible at the same turn of the "edit team" dialogue.
What is the expected correct behavior?
If a to-be-added team member is BIEB, they should directly be selectable as manager.
Relevant error messages and/or screenshots
