Fix a nan loss handling edge case when downsample is set to zero #439
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subj
I've stumbled on an error while running a sweep for puffer_grid.
puffer_grid has downsample=0 in its config, so downsample function returns an empty list.
One of the runs ended with nan losses, and given that downsample function returned empty lists (scores, costs, timesteps), scores.pop() resulted in an IndexError.