Issue Description: Migrating config file from bukkit to fabric throws exceptions on player join

• Dynmap Version: master
• Server Version: fabric 1.17
• Pastebin of Configuration.txt: https://hastebin.com/tiporahode.yaml
• Pastebin of crashlogs or other relevant logs: https://hastebin.com/buqofivelo.css
• Steps to Replicate: Copy bukkit config to fabric server

[x] I have looked at all other issues and this is not a duplicate
[x] I have been able to replicate this

Possible same issue here in a different way. On every command (like /dynmap fullrender) in the game I got following error message: "Während der Ausführung dieses Befehls ist ein Fehler aufgetreten" with Details:

Cannot invoke

org.dynmap.permissions.permissionsHandler.hasPermission(String, String) because "ph" is null

They aren't compatible - things like render triggers are platform specific.

Sure, but a nullref isn't the way you should find out about that

Feel free to kick in a PR with all the thorough foolproofing you'd like to see in the config file loading and processing.