perf: improve perf error handling

[ilyar]

#8 #6

[codecov]

Codecov Report

Merging #10 into master will increase coverage by 6.28%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master      #10      +/-   ##
==========================================
+ Coverage   84.03%   90.32%   +6.28%     
==========================================
  Files           6        6              
  Lines         119      124       +5     
==========================================
+ Hits          100      112      +12     
+ Misses         17       11       -6     
+ Partials        2        1       -1

Impacted Files	Coverage Δ
api/routers.go	100% <ø> (ø)	⬆️
cmd/document/pdf.go	95.12% <100%> (ø)	⬆️
cmd/template/template.go	100% <100%> (+24.13%)	⬆️

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