Fix/circular

[malstoun]

In some cases (when we had one error) circular structure was created in error object.

Now, if we will have one error we throw it without linking it to itself in queryErrors.

[codecov]

Codecov Report

Merging #60 into master will decrease coverage by 1.07%.
The diff coverage is 0%.

@@            Coverage Diff             @@
##           master      #60      +/-   ##
==========================================
- Coverage   91.01%   89.94%   -1.08%     
==========================================
  Files          16       16              
  Lines         167      169       +2     
  Branches       41       41              
==========================================
  Hits          152      152              
- Misses         14       16       +2     
  Partials        1        1

Impacted Files	Coverage Δ
src/server/index.js	83.33% <0%> (-2.88%)	⬇️

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[gregberge]

Thanks!