As shown in the figure below, there are times when a block associated with a drawing shows as empty in the View panel.

Empty block

It is not possible to remove this type of block with the Delete option (it is greyed out) because the empty block has been inserted somewhere in the drawing. Because it does not contain any entities, it is not possible to select it so remains invisible. This movie (courtesy of DW, a gCADPlus user in Europe) shows how to rid a drawing of blocks of this type.

 

Empty blocks