Fix crash when trying to delete non-existent record

[dvora-h]

Fixes #355

[codecov-commenter]

Codecov Report

Merging #372 (6205d3a) into main (c6fb00b) will increase coverage by 0.16%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #372      +/-   ##
==========================================
+ Coverage   77.64%   77.80%   +0.16%     
==========================================
  Files          14       14              
  Lines        1154     1158       +4     
==========================================
+ Hits          896      901       +5     
+ Misses        258      257       -1     

Flag	Coverage Δ
unit	77.80% <100.00%> (+0.16%)	⬆️

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Impacted Files	Coverage Δ
aredis_om/model/model.py	86.68% <100.00%> (+0.17%)	⬆️

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