Fix representation for single constraints without coordinates

[FabianHofmann]

No description provided.

[codecov]

Codecov Report

Base: 89.55% // Head: 89.57% // Increases project coverage by +0.01% 🎉

Coverage data is based on head (9562ce6) compared to base (e64f59a).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #92      +/-   ##
==========================================
+ Coverage   89.55%   89.57%   +0.01%     
==========================================
  Files          14       14              
  Lines        2681     2686       +5     
  Branches      416      416              
==========================================
+ Hits         2401     2406       +5     
  Misses        198      198              
  Partials       82       82              

Impacted Files	Coverage Δ
linopy/common.py	93.39% <100.00%> (+0.06%)	⬆️
linopy/constraints.py	94.68% <100.00%> (+0.05%)	⬆️
linopy/variables.py	91.64% <100.00%> (ø)

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