Improve error code when platform not available for OS

[alessio-perugini]

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• The PR has no duplicates (please search among the Pull Requests
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• The PR follows
  our contributing guidelines
• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)
• UPGRADING.md has been updated with a migration guide (for breaking changes)
• configuration.schema.json updated if new parameters are added.

What kind of change does this PR introduce?

Closes #2932

What is the current behavior?

What is the new behavior?

Does this PR introduce a breaking change, and is titled accordingly?

Other information

[codecov]

Codecov Report

Attention: Patch coverage is 60.00000% with 4 lines in your changes missing coverage. Please review.

Project coverage is 67.84%. Comparing base (2947cfb) to head (40ea05e).
Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
commands/cmderrors/cmderrors.go	33.33%	4 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #2933   +/-   ##
=======================================
  Coverage   67.84%   67.84%           
=======================================
  Files         238      238           
  Lines       22442    22450    +8     
=======================================
+ Hits        15226    15232    +6     
- Misses       6014     6017    +3     
+ Partials     1202     1201    -1     

Flag	Coverage Δ
unit	67.84% <60.00%> (+<0.01%)	⬆️

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[per1234]

Thanks Alessio!