Guard against OPENC3_LOCAL_MODE_PATH not existing

[jmthomas]

The bug only appears in Kubernetes when you do NOT have local mode.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 78.29%. Comparing base (b9da278) to head (d6a9671).
⚠️ Report is 3 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2985   +/-   ##
=======================================
  Coverage   78.28%   78.29%           
=======================================
  Files         672      672           
  Lines       55181    55184    +3     
  Branches      728      728           
=======================================
+ Hits        43200    43204    +4     
+ Misses      11903    11902    -1     
  Partials       78       78           

Flag	Coverage Δ
python	79.49% <ø> (+<0.01%)	⬆️
ruby-api	83.82% <ø> (ø)
ruby-backend	81.37% <100.00%> (+<0.01%)	⬆️

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud