WarblreEquiv: don't generate a Union with CdEmpty for each Class Ranges - #37
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Currently, when translating from Warblre to Linden, each Character Class Range (in between
[]) is translated to some Unions.Because this is implemented as a fold on the list of elements in the Class Range, in the final case, the Unions contain
CdEmpty.This change detects when the remaining part of the list would be translated to
CdEmpty, and removes this useless branch.