Add better error message when node.state() throws error during DAG validation.

[tobiasraabe]

No description provided.

[codecov]

Codecov Report

All modified lines are covered by tests ✅

Comparison is base (132f515) 95.44% compared to head (a4be3be) 95.45%.

❗ Current head a4be3be differs from pull request most recent head 9d58501. Consider uploading reports for the commit 9d58501 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #429      +/-   ##
==========================================
+ Coverage   95.44%   95.45%   +0.01%     
==========================================
  Files          96       96              
  Lines        8478     8500      +22     
==========================================
+ Hits         8092     8114      +22     
  Misses        386      386              

Flag	Coverage Δ
end_to_end	82.71% <30.43%> (-0.15%)	⬇️
integration	39.50% <17.39%> (-0.06%)	⬇️
unit	65.69% <100.00%> (+0.33%)	⬆️

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Files	Coverage Δ
src/_pytask/dag.py	100.00% <100.00%> (ø)
src/_pytask/traceback.py	97.91% <100.00%> (+0.18%)	⬆️
tests/test_dag.py	97.97% <100.00%> (+0.13%)	⬆️

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