Handle initialization errors in Tunny UI with a dedicated error message

[hrntsm]

Reference Issues/PRs

What does this implement/fix? Explain your changes.

• Handle initialization errors in Tunny UI with a dedicated error message

[codeclimate]

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 45.57%. Comparing base (9622f23) to head (9334e6f).
Report is 3 commits behind head on develop.

Additional details and impacted files

@@           Coverage Diff            @@
##           develop     #423   +/-   ##
========================================
  Coverage    45.57%   45.57%           
========================================
  Files           67       67           
  Lines         3030     3030           
  Branches       332      332           
========================================
  Hits          1381     1381           
  Misses        1610     1610           
  Partials        39       39           

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