Add checks and tests for NaN in constraints

[odow]

Closes #2233

[codecov]

Codecov Report

Merging #2272 into master will decrease coverage by 0.27%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #2272      +/-   ##
==========================================
- Coverage   91.41%   91.13%   -0.28%     
==========================================
  Files          42       42              
  Lines        4193     4196       +3     
==========================================
- Hits         3833     3824       -9     
- Misses        360      372      +12     

Impacted Files	Coverage Δ
src/aff_expr.jl	88.02% <100.00%> (+0.17%)	⬆️
src/macros.jl	93.11% <100.00%> (+0.03%)	⬆️
src/Containers/vectorized_product_iterator.jl	35.71% <0.00%> (-7.15%)	⬇️
src/mutable_arithmetics.jl	85.71% <0.00%> (-6.35%)	⬇️
src/Containers/SparseAxisArray.jl	74.64% <0.00%> (-4.52%)	⬇️
src/copy.jl	88.00% <0.00%> (-4.00%)	⬇️
src/Containers/DenseAxisArray.jl	85.29% <0.00%> (-1.97%)	⬇️
src/operators.jl	87.67% <0.00%> (-0.69%)	⬇️

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