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**Related issue:** Resolves#38109
# Checklist for submitter
## Testing
- [x] Added/updated automated tests
- [x] QA'd all new/changed functionality manually
<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit
* **Bug Fixes**
* Improved validation to reject certificate templates with empty or
whitespace-only subject names and provide clearer error messaging when
the certificate template subject name is required.
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settings.</sub>
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
Victor Lyuboslavsky
cb3f6184c9