Ignore non-exist object folder when removing a region

[jt2594838]

Description

When removing a data region, ignore the case where the object folder does not exist.

Verification

Not run; branch contains a small guard change only.

[sonarqubecloud]

Quality Gate passed

Issues
3 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
2.1% Duplication on New Code

See analysis details on SonarQube Cloud

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 40.85%. Comparing base (66d0c07) to head (8024334).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff              @@
##             master   #17840      +/-   ##
============================================
- Coverage     40.98%   40.85%   -0.14%     
  Complexity     2611     2611              
============================================
  Files          5188     5188              
  Lines        351973   351987      +14     
  Branches      45071    45078       +7     
============================================
- Hits         144272   143790     -482     
- Misses       207701   208197     +496     

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