Fixed a bug when compiled without netcdf4
Fixed a bug when compiled without netcdf4

alexandremorlet/yambopy,alexmoratalla/yambo-py,henriquemiranda/yambopy,palful/yambopy,henriquemiranda/yambo-py,henriquemiranda/yambo-py,henriquemiranda/yambopy,alexmoratalla/yambo-py,alexmoratalla/yambopy,alexmoratalla/yambopy,alexandremorlet/yambopy,palful/yambopy