Delete list when empty

src/main/java/eu/ruekov/ruakij/LinkedBeaconTeleporters/linkedBeaconTeleporter/LinkedBeaconTeleporterBlock.java

@@ -42,7 +42,13 @@ public class LinkedBeaconTeleporterBlock extends LinkedBeaconTeleporter {
 
         // Remove from list
         this.linkedBeaconTeleporters.remove(this);
-        // TODO: Remove from placedLBTsById when empty?
+
+        if(this.linkedBeaconTeleporters.size() == 0){
+            // List empty, delete from placedLBTsById
+            LinkedBeaconTeleporterManager.placedLBTsById.remove(
+                    this.teleporterId
+            );
+        }
 
         // Remove from loc
         LinkedBeaconTeleporterManager.placedLBTByLoc.remove(