Bug fix: WarpMarkers still unloaded if Essentials not running on start up instead of listening for Essentials.
We have no way of knowing if we get the event when a player interacts with a sign before or after the Essentials plugin. This means that we cannot check if the user has enough credits if the warp-sign costs credits to use. This can lead to false events being showed on the map when a user without enough credits clicks on the sign.
