Handle the empty input case in ReactionModelBasedEvaluator #27
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AustinT
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Node evaluators based on
ReactionModelBasedEvaluatorcan perform normalization; if done in log space, this can fail if the input list is empty (due to takingmaxof an empty array). Whether empty lists are actually passed in for evaluation depends on the exact algorithm (it does not seem to happen in MCTS, but does happen in Retro*), so it's best to guard against that in the evaluator itself as done in this PR.