[rust] Fix deleteModel error

[xyang16]

Description

Brief description of what this PR is about

• If this change is a backward incompatible change, why must this change be made?
• Interesting edge cases to note here

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 63.52%. Comparing base (97c6a0d) to head (ede6370).
Report is 5 commits behind head on master.

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Additional details and impacted files

@@             Coverage Diff              @@
##             master    #3229      +/-   ##
============================================
- Coverage     63.52%   63.52%   -0.01%     
+ Complexity     6453     6452       -1     
============================================
  Files           697      697              
  Lines         32808    32808              
  Branches       3419     3419              
============================================
- Hits          20842    20841       -1     
  Misses        10388    10388              
- Partials       1578     1579       +1     

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