Child exceptions

[rmcdaniel]

Throw exception rather than calling parent failed directly.

[rmcdaniel]

Fixes #347

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (1542cda) to head (df4a11b).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff             @@
##              master      #348   +/-   ##
===========================================
  Coverage     100.00%   100.00%           
- Complexity       565       572    +7     
===========================================
  Files             61        61           
  Lines           1954      1990   +36     
===========================================
+ Hits            1954      1990   +36     

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