Description

Setting a blank prefix in a group, i.e "", will work until restart then on restart LP will throw an error and not load any prefixes.

Only an issue with "storage-method: yaml". Works correctly when in db mode.

Reproduction steps

1. /lp creategroup newgroup
2. /lp group newgroup meta addprefix 1 ""
3. /lp user you parent add newgroup
4. Restart the server

Expected behaviour

A player with no prefix.

Environment details

Paper 243. 1.17.1
LP v5.3.48

Log output: https://gist.github.com/Internal-Exception/9a77cbb20b554dd200aedf1fee7b8644
Group file after restart: https://gist.github.com/Internal-Exception/510ac47e5a07bbdde05dbd49bca23ddb

Any other relevant details

Should be fixed by that commit - you may need to delete the broken lines from the .yml file to get it to start nicely.