sry haven't logged in in a while. thx for the report, should be fixed now.
Reason was that back then i didn't think about that someone would ever set up a blueprint containing only tiles and tiles don't count as entities so i didn't believe there would ever be a blueprint not containing any entities. This was incredibly easy to fix just by checking first whether the blueprint contains any entities or not.
Additionally i fixed an issue where blueprinted provider chests wouldn't be updated into requester mode, making it impossible for bots to build them since you can't craft the chests in provider mode, so this was definitely necessary.
