Prevent NPE when removing NIC from a stopped VM using service offering with CPU cap set

[Pearl1594]

Description

This PR fixes: #12225

Types of changes

• [ ] Breaking change (fix or feature that would cause existing functionality to change)
• [ ] New feature (non-breaking change which adds functionality)
• [X] Bug fix (non-breaking change which fixes an issue)
• [ ] Enhancement (improves an existing feature and functionality)
• [ ] Cleanup (Code refactoring and cleanup, that may add test cases)
• [ ] Build/CI
• [ ] Test (unit or integration test code)

Feature/Enhancement Scale or Bug Severity

Bug Severity

• [ ] BLOCKER
• [ ] Critical
• [ ] Major
• [X] Minor
• [ ] Trivial

Screenshots (if appropriate):

How Has This Been Tested?

How did you try to break this feature and the system with this change?

[codecov[bot]]

Codecov Report

:white_check_mark: All modified and coverable lines are covered by tests. :white_check_mark: Project coverage is 16.21%. Comparing base (4348386) to head (3dac829).

Additional details and impacted files

@@            Coverage Diff            @@
##               4.20   #12232   +/-   ##
=========================================
  Coverage     16.21%   16.21%           
- Complexity    13353    13355    +2     
=========================================
  Files          5657     5657           
  Lines        498647   498648    +1     
  Branches      60533    60533           
=========================================
+ Hits          80863    80875   +12     
+ Misses       408771   408755   -16     
- Partials       9013     9018    +5     

Flag	Coverage Δ
uitests	4.00% <ø> (ø)
unittests	17.07% <100.00%> (+<0.01%)	:arrow_up:

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[sonarqubecloud[bot]]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
100.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[Pearl1594]

@blueorangutan package

[blueorangutan]

@Pearl1594 a [SL] Jenkins job has been kicked to build packages. It will be bundled with KVM, XenServer and VMware SystemVM templates. I'll keep you posted as I make progress.

[blueorangutan]

Packaging result [SF]: ✔️ el8 ✔️ el9 ✔️ el10 ✖️ debian ✔️ suse15. SL-JID 16007