Accept empty lists on the DZN grammar. #198
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Before this change, empty lists were wrongly parsed as a list with a singleton Null element.
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Fixes mzn-challenge/2020/racp/racp.mzn with mzn-challenge/2020/racp/j30_26_2_1.0.dzn. |
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Before this change, empty lists were wrongly parsed as a list with a singleton Null element.