Fix error handling in cmd

[spyzhov]

No description provided.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 30.43478% with 16 lines in your changes are missing coverage. Please review.

Project coverage is 87.40%. Comparing base (d59d485) to head (06e9e68).

Files	Patch %	Lines
cmd/ajson/main.go	0.00%	16 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##           master      #66      +/-   ##
==========================================
- Coverage   92.40%   87.40%   -5.00%     
==========================================
  Files          10       11       +1     
  Lines        2870     3034     +164     
==========================================
  Hits         2652     2652              
- Misses        145      309     +164     
  Partials       73       73              

Flag	Coverage Δ
unittests	87.40% <30.43%> (-5.00%)	⬇️

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