add blue light for drive and ME chest (#75)

src/main/java/thaumicenergistics/common/items/ItemEssentiaCell.java

@@ -57,8 +57,8 @@ public class ItemEssentiaCell extends Item implements ICellHandler {
     /**
      * Status of the cell.
      */
-    private static final int CELL_STATUS_MISSING = 0, CELL_STATUS_HAS_ROOM = 1, CELL_STATUS_TYPES_FULL = 2,
-            CELL_STATUS_FULL = 3;
+    private static final int CELL_STATUS_MISSING = 0, CELL_STATUS_EMPTY = 1, CELL_STATUS_HAS_ROOM = 2,
+            CELL_STATUS_TYPES_FULL = 3, CELL_STATUS_FULL = 4;
 
     /**
      * Icons for each type.
@@ -262,6 +262,11 @@ public class ItemEssentiaCell extends Item implements ICellHandler {
             return ItemEssentiaCell.CELL_STATUS_TYPES_FULL;
         }
 
+        // Total Empty
+        if (cellHandler.getUsedBytes() == 0) {
+            return ItemEssentiaCell.CELL_STATUS_EMPTY;
+        }
+
         // Full bytes?
         if (cellHandler.getUsedBytes() == cellHandler.getTotalBytes()) {
             return ItemEssentiaCell.CELL_STATUS_FULL;