attempt to get argmax of an empty sequence

hgm_outer.log In the last step, run.sh reports the error log as above.

I tried to modify the 'if np.isfinite(node.mean_utility) and node.mean_utility > 0' in hgm.py into 'if np.isfinite(node.mean_utility) and node.mean_utility >= 0', the program is running, but I'm not sure if it's theoretically right...