Bugfix/API failure with bogus auth header

[alexskr]

• fix for bogus Authorization headers causes internal server error #178
• minitest style guide adherence

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (809c54f) 80.78% compared to head (ee31d14) 80.78%.

Additional details and impacted files

@@           Coverage Diff            @@
##           develop     #179   +/-   ##
========================================
  Coverage    80.78%   80.78%           
========================================
  Files           63       63           
  Lines         4913     4914    +1     
========================================
+ Hits          3969     3970    +1     
  Misses         944      944           

Flag	Coverage Δ
unittests	80.78% <100.00%> (+<0.01%)	⬆️

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