How can you remove the empty layers from the drawing?

 From the layer list can be removed or deleted

• Click the Application button Drawing Utilities Purge.
• The Purge dialog box displays a tree view of object types, called named objects, with items that can be removed from the drawing.
• To purge unreferenced layers, use one of the following methods: To purge all unreferenced layers, choose Layers. ...
• Click Purge.