Our teammate (who's done this a bit longer than we have) saw it in competition (and kudos to him for knowing what to do -- he was probably 11 or 12 at the time!).There are several methods for that. One is to add 0.5 to every cell, another is to add it to only the cell with the 0. Either way you aren't doing a pure Odds Ratio, but a Modified Maximum Likelihood Estimator of the OR.
ETA: you shouldn't see that situation arise in competition, though.
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