fix: skip cves missing in mapping

[psegedy]

RHINENG-12773

[jira-linking]

Referenced Jiras:
https://issues.redhat.com/browse/RHINENG-12773

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 25.00000% with 6 lines in your changes missing coverage. Please review.

Project coverage is 57.46%. Comparing base (86f6b90) to head (52c75e0).
Report is 43 commits behind head on main.

Files with missing lines	Patch %	Lines
vmaas/vulnerabilities.go	25.00%	4 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #72      +/-   ##
==========================================
+ Coverage   56.74%   57.46%   +0.72%     
==========================================
  Files          11       11              
  Lines        2062     1949     -113     
==========================================
- Hits         1170     1120      -50     
+ Misses        838      758      -80     
- Partials       54       71      +17     

Flag	Coverage Δ
unittests	57.46% <25.00%> (+0.72%)	⬆️

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