Description of your improvement: Make deleting a blood pledge done by removing all items out of the storage, and/or being the only member (royal) left inside the pledge.
Why are you suggesting it? (What does it solve for?) It would allow people to be unable to accidentally wipe their pledge, and in turn, the storage with stuff potentially inside.
How it currently exists today: As it stands currently, the royal is able to just "leave" the bp, which fully disbands without an acknowledgement, therefore wiping the bp storage and whatever was inside of it.