* text.c (undo_cut, redo_cut): Don't actually try and undo/redo an empty cut, i.e. the magicline. 
	  Fixes crash on cutting last line discovered by Eitan Adler <eitanadlerlist@gmail.com>.



git-svn-id: svn://svn.savannah.gnu.org/nano/trunk/nano@4397 35c25a1d-7b9e-4130-9fde-d3aeb78583b8