Error logging added

src/engine/InterestManagement/Terrain.java

@@ -44,7 +44,7 @@ public class Terrain {
         this.terrain_pixel_data = Terrain._heightmap_pixel_cache.get(heightmap);
 
         if (terrain_pixel_data == null)
-            Logger.error("Pixel map empty");
+            Logger.error("Pixel map empty for zone: " + zone.getObjectUUID() + ":" + zone.zoneName);
 
         this.cell_count.x = this.terrain_pixel_data.length - 1;
         this.cell_count.y = this.terrain_pixel_data[0].length - 1;