fix: add guard for owner_id nil dereference

[dominikvagner]

Summary

This commit changed OwnerID to a pointer. This adds a guard for that in /listener/upload.go to prevent nil pointer dereferences.

Summary by Sourcery

Bug Fixes:

• Prevent nil pointer dereference when OwnerID is missing in host system profiles during template assignment.

[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

Adds a nil-check guard and warning log before using SystemProfile.OwnerID in hostTemplate to prevent nil-pointer dereferences when assigning templates.

File-Level Changes

Change	Details	Files
Guard use of SystemProfile.OwnerID in hostTemplate to avoid nil-pointer dereference and add observability when owner_id is missing.	Add early-return check for nil SystemProfile.OwnerID in hostTemplate Log a warning including inventoryID and host.ID when owner_id is missing before template assignment logic Preserve existing template assignment flow when OwnerID is present	listener/upload.go

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[github-actions]

SC Environment Impact Assessment

Overall Impact: ⚪ NONE

No SC Environment-specific impacts detected in this PR.

What was checked

This PR was automatically scanned for:

• Database migrations
• ClowdApp configuration changes
• Kessel integration changes
• AWS service integrations (S3, RDS, ElastiCache)
• Kafka topic changes
• Secrets management changes
• External dependencies

[sourcery-ai]

Hey - I've reviewed your changes and they look great!

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[codecov-commenter]

Codecov Report

❌ Patch coverage is 0% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 59.16%. Comparing base (986f68e) to head (d90c4e8).

Files with missing lines	Patch %	Lines
listener/upload.go	0.00%	2 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2138      +/-   ##
==========================================
- Coverage   59.18%   59.16%   -0.03%     
==========================================
  Files         134      134              
  Lines        8625     8628       +3     
==========================================
  Hits         5105     5105              
- Misses       2985     2987       +2     
- Partials      535      536       +1     

Flag	Coverage Δ
unittests	59.16% <0.00%> (-0.03%)	⬇️

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