fix key error reported by sentry

[pindge]

fixes #439

[codecov]

Codecov Report

Base: 86.95% // Head: 86.60% // Decreases project coverage by -0.34% ⚠️

Coverage data is based on head (3163490) compared to base (7079998).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #440      +/-   ##
===========================================
- Coverage    86.95%   86.60%   -0.35%     
===========================================
  Files           25       23       -2     
  Lines         3158     3017     -141     
===========================================
- Hits          2746     2613     -133     
+ Misses         412      404       -8     

Impacted Files	Coverage Δ
cubedash/_utils.py	87.19% <100.00%> (+0.03%)	⬆️
cubedash/__init__.py
cubedash/_model.py

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