Do not block on invalid token

[thepieterdc]

This PR fixes error handling for invalid/missing tokens by making the error message non-blocking.

Fixes #256

[codecov]

Codecov Report

Merging #258 (b6f9a7f) into master (a89f8ea) will decrease coverage by 0.18%.
The diff coverage is 23.52%.

@@            Coverage Diff             @@
##           master     #258      +/-   ##
==========================================
- Coverage   47.73%   47.55%   -0.19%     
==========================================
  Files          34       34              
  Lines         553      553              
  Branches       93       94       +1     
==========================================
- Hits          264      263       -1     
  Misses        274      274              
- Partials       15       16       +1     

Flag	Coverage Δ
integration	47.19% <23.52%> (-0.19%)	⬇️
unit	75.00% <ø> (ø)

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Impacted Files	Coverage Δ
src/api/client.ts	74.41% <0.00%> (ø)
src/treeView/dataProvider.ts	20.00% <12.50%> (ø)
src/extension.ts	78.78% <75.00%> (-3.04%)	⬇️

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