feat: not logging warnings when offline

[2ndalpha]

Reducing noise when browser is offline.
This PR does not change any functionality - only logging.

Related issues

Checklist

• Code is covered with tests.

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 55.00000% with 9 lines in your changes missing coverage. Please review.

Project coverage is 81.62%. Comparing base (2cf2f98) to head (1134eb5).
Report is 2 commits behind head on master.

Files	Patch %	Lines
src/lib/services/graphql/graphql.service.ts	55.00%	9 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##           master     #729      +/-   ##
==========================================
- Coverage   82.31%   81.62%   -0.70%     
==========================================
  Files          23       23              
  Lines         786      800      +14     
  Branches      140      143       +3     
==========================================
+ Hits          647      653       +6     
- Misses        130      146      +16     
+ Partials        9        1       -8     

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