complex_array_to_rgb also for zero array
complex_array_to_rgb also for zero array

zasdfgbnm/qutip,cgranade/qutip,qutip/qutip,zasdfgbnm/qutip,qutip/qutip,cgranade/qutip,anubhavvardhan/qutip,anubhavvardhan/qutip