fix incorrect sparse array allocation introduced in cda76da34693 * Sparse.h (Sparse<T>::SparseRep::SparseRep (octave_idx_type, octave_idx_type, octave_idx_type)): Don't allocate D or R arrays if NZ is 0. Initialize all elements of C to 0.

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