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Issue Description: Dynmap throws an error while server is starting, and disables itself.

• Dynmap Version: v3.4-beta-5-806
• Server Version: git-Paper-387 (MC: 1.18.2)
• Pastebin of Configuration.txt: https://pastebin.com/6i3aydan
• Server Host (if applicable): OVH
• Pastebin of crashlogs or other relevant logs: https://pastebin.com/FFmTjCU4
• Other Relevant Data/Screenshots: started happening 1-2 days after using this method: https://pastebin.com/Rm9Q79MZ
• Steps to Replicate: Added new markers with this method https://pastebin.com/Rm9Q79MZ and restarted server.

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

just tested, if you remove all of the allowedicons entries it works, don't see that feature documented on the api page: https://gist.github.com/JOO200/eb99b294ebd16a353750f83d8dcdce23
maybe it is not supported?

Sorry, I sent the wrong method, this was what I used:
DynUtil.marker.createMarkerSet(markerName.toLowerCase(), markerName, Sets.newHashSet(getMarkerIcon()), true).setDefaultMarkerIcon(getMarkerIcon());

Replacing it with:
DynUtil.marker.createMarkerSet(markerName.toLowerCase(), markerName, null, true).setDefaultMarkerIcon(getMarkerIcon());

and removing all allowedicons entries fixed it. Thanks.

that is not a bug, each marker needs an icon, and from what I can see, that hasn't been defined in that method (maybe the set has no defaulticon?)

Dynmap disables itself before my plugin loads.
This is my markers.yml: https://pastebin.com/9mxxCW8B
All markers have valid deficon and allowedicons.
I'm only using builtin icons (from https://github.com/webbukkit/dynmap/wiki)
Removing markers.yml fixes this, but after my plugin created the same markers and restarting > Dynmap disables itself again