Added error callback for when we fail in onEnd

[mastrzyz]

[SBoudrias]

Hi @mastrzyz, thanks for sending a PR.

Could you help fixing the CI issues? And instead of an examples, adding a unit test would be more resilient - so it'd be awesome if you have time to add that in!

[codecov[bot]]

Codecov Report

Patch coverage: 78.26% and project coverage change: +4.64% :tada:

Comparison is base (c4d0626) 72.29% compared to head (729a554) 76.94%. Report is 18 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1265      +/-   ##
==========================================
+ Coverage   72.29%   76.94%   +4.64%     
==========================================
  Files          42       42              
  Lines        4083     4138      +55     
  Branches      665      735      +70     
==========================================
+ Hits         2952     3184     +232     
+ Misses        475      228     -247     
- Partials      656      726      +70     

Files Changed	Coverage Δ
packages/inquirer/lib/prompts/confirm.js	80.76% <76.92%> (-1.05%)	:arrow_down:
packages/inquirer/lib/prompts/input.js	83.92% <80.00%> (-2.06%)	:arrow_down:

... and 8 files with indirect coverage changes

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[mastrzyz]

Hey @SBoudrias , fixed CI and added a UT!, let me know if this is fine or you would like one for each prompt.