Ignore terms with 0 coefficients

[sacpis]

Ignore terms with 0 coefficients

Test result

def hamiltonian_clique_graph(penalty, nodes, weights, non_edges) -> cudaq.SpinOperator:

    spin_ham = 0.0
    for wt, node in zip(weights, nodes):
        #print(wt,node)
        spin_ham += 0.5 * wt * spin.z(node)
        spin_ham -= 0.5 * wt * spin.i(node)

    for non_edge in non_edges:
        u, v = (non_edge[0], non_edge[1])
        spin_ham += penalty / 4.0 * (spin.z(u) * spin.z(v) - spin.z(u) -
                                     spin.z(v) + spin.i(u) * spin.i(v))

    return spin_ham

print(hamiltonian_clique_graph(2., [0,1], [1., 1.], [[0,1]]))

root@ae0fb315fdde:/workspaces/cuda-quantum# python3 docs/sphinx/examples/python/test1.py 
[0.5+0j] ZZ
[-0.5+0j] II