Return copy of class object when using null indexing (bug #44940). * ov-classdef.cc (cdef_object_scalar::subsref): Check index expression and return octave_value of this_obj if empty. * ov-classdef.cc (cdef_object_array::subsref): Remove error when index expression is empty. If expression is empty then return cdef_object of this.

*~
*.user
*.o
*.a
Makefile*
*.pdb
debug/
release/