[Utilities] Remove EMPTYSTRING #2283
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This seemed like such a random design choice.
So I traced it back to jump-dev/JuMP.jl@cb8b47f.
At one point, JuMP used an explicit
UTF8Stringtype for names, and calling""did not make that type, so it was convenient to have an "empty UTF8String" sitting there in one place. Even onceStringcame along, we kept it, and the variable even successfully made the transition to MathOptInterface!