fixed bug in the detection of system size in case the first hamiltonian term is a time-dependent list format
fixed bug in the detection of system size in case the first hamiltonian term is a time-dependent list format

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