refact pkg/apiserver: happy path; nil guard

[mmetc]

No description provided.

[github-actions]

@mmetc: There are no area labels on this PR. You can add as many areas as you see fit.

• /area agent
• /area local-api
• /area cscli
• /area appsec
• /area security
• /area configuration

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[codecov]

Codecov Report

❌ Patch coverage is 59.09091% with 18 lines in your changes missing coverage. Please review.
✅ Project coverage is 62.91%. Comparing base (5fcc066) to head (1bf6c27).
⚠️ Report is 2 commits behind head on master.

Files with missing lines	Patch %	Lines
pkg/apiserver/apiserver.go	0.00%	9 Missing ⚠️
pkg/apiserver/controllers/v1/metrics.go	73.33%	4 Missing and 4 partials ⚠️
pkg/apiserver/middlewares/v1/jwt.go	66.66%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #4180      +/-   ##
==========================================
+ Coverage   62.89%   62.91%   +0.01%     
==========================================
  Files         467      467              
  Lines       33280    33272       -8     
==========================================
  Hits        20932    20932              
+ Misses      10225    10214      -11     
- Partials     2123     2126       +3     

Flag	Coverage Δ
bats	46.10% <56.81%> (-0.03%)	⬇️
unit-linux	35.67% <59.09%> (-0.05%)	⬇️
unit-windows	25.04% <0.00%> (+0.02%)	⬆️

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[sabban]

lgtm