NLPBlockDual is set by optimize

[mlubin]

This was silently broken because it's covered only by JuMP/test/nlp_solver.jl.

[codecov-io]

Codecov Report

Merging #576 into master will decrease coverage by 0.01%.
The diff coverage is 0%.

@@            Coverage Diff             @@
##           master     #576      +/-   ##
==========================================
- Coverage   95.68%   95.67%   -0.02%     
==========================================
  Files          47       47              
  Lines        4847     4856       +9     
==========================================
+ Hits         4638     4646       +8     
- Misses        209      210       +1

Impacted Files	Coverage Δ
src/nlp.jl	0% <0%> (ø)	⬆️
src/attributes.jl	96.15% <0%> (+0.43%)	⬆️

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