Fix printing when show called on invalid variable or constraint

[odow]

Closes #3762

• Test extensions: https://github.com/jump-dev/JuMP.jl/actions/runs/9312266581

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.38%. Comparing base (99ab0b2) to head (78018cc).

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #3763   +/-   ##
=======================================
  Coverage   98.38%   98.38%           
=======================================
  Files          44       44           
  Lines        5873     5879    +6     
=======================================
+ Hits         5778     5784    +6     
  Misses         95       95           

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[blegat]

We can ignore PolyJuMP and SumOfSquares failing, I'm doing a big refactoring

[odow]

So you're okay with just printing "InvalidXXX"?

[blegat]

Yes, the variable is invalid so using it in a model should throw but we could allow printing it and InvalidXXX seems reasonable.