Better handling of failed config requests

[kroleg]

show useful error message if there is no response from configcat api

Describe the purpose of your pull request

If developer has some issues with networking (in my case it was nodejs not picking up root cert) then returned error (because response is empty) is "Status: undefined - undefined" which is not very useful

Related issues (only if applicable)

Provide links to issues relating to this pull request

Requirement checklist (only if applicable)

• [ ] I have covered the applied changes with automated tests.
• [x] I have executed the full automated test set against my changes.
• [ ] I have validated my changes against all supported platform versions.
• [x] I have read and accepted the contribution agreement.

[sonarcloud[bot]]

Kudos, SonarCloud Quality Gate passed!

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

No Coverage information
0.0% Duplication

[endret]

Dear @kroleg ,

Thank you for your pull request. It looks fine and we can merge it, but despite that your changes is tiny you have to accept our contribution agreement in the PR description.

Regards Endre

[kroleg]

@endret thanks. I've accepted contribution agreement

[codecov[bot]]

Codecov Report

Merging #24 (efd8ac2) into master (8738dd8) will decrease coverage by 7.08%. The diff coverage is 75.00%.

:exclamation: Current head efd8ac2 differs from pull request most recent head 7d2e009. Consider uploading reports for the commit 7d2e009 to get more accurate results

@@            Coverage Diff             @@
##           master      #24      +/-   ##
==========================================
- Coverage   77.08%   70.00%   -7.09%     
==========================================
  Files           2        2              
  Lines          48       40       -8     
  Branches        8        9       +1     
==========================================
- Hits           37       28       -9     
- Misses         11       12       +1     

Impacted Files	Coverage Δ
src/config-fetcher.ts	65.71% <75.00%> (+0.08%)	:arrow_up:
src/client.ts	100.00% <0.00%> (ø)

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