bug fix rename leaving dangling specifications
bug fix rename leaving dangling specifications

The asset manager finishes processing changes by iterating the
specifications object.  There is working code to remove components if a
layer name was ‘player.png’ and is now just ‘player’, but leaving empty
arrays out of the specifications object prevented it from running

PaladinStudiosBVs/generator-assets,PaladinStudiosBVs/generator-assets,adobe-photoshop/generator-assets,adobe-photoshop/generator-assets