Do not panic on missing vulnerabilities file

[mostlikelee]

Checklist for submitter

Fixing new years bug when no vulnerabilities exist on Jan 1. Vuln job: https://github.com/fleetdm/vulnerabilities/actions/runs/12571146169/job/35041711151

• Changes file added for user-visible changes in changes/, orbit/changes/ or ee/fleetd-chrome/changes.
  See Changes files for more information.
• Added/updated tests
• Manual QA for all new/changed functionality

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 4 lines in your changes missing coverage. Please review.

Project coverage is 63.83%. Comparing base (5a30b47) to head (c60571c).
Report is 137 commits behind head on main.

Files with missing lines	Patch %	Lines
cmd/cve/generate.go	0.00%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #25081      +/-   ##
==========================================
+ Coverage   63.82%   63.83%   +0.01%     
==========================================
  Files        1614     1614              
  Lines      153582   153586       +4     
  Branches     4040     4040              
==========================================
+ Hits        98026    98047      +21     
+ Misses      47752    47741      -11     
+ Partials     7804     7798       -6     

Flag	Coverage Δ
backend	64.71% <0.00%> (+0.01%)	⬆️

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