Some plugins apparently create UPDATE packets with an empty String for the collision rule and nametag visibility. I can't see how that is valid and we can not properly recreate it using the data class constructor, so fall back to the default visibility instead.
Some plugins apparently create UPDATE packets with an empty String for the collision rule and nametag visibility. I can't see how that is valid and we can not properly recreate it using the data class constructor, so fall back to the default visibility instead.
Closes #642.