added unit test for expect+states output for case with no collapse operators
added unit test for expect+states output for case with no collapse operators

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