Fix: Handle non-ASCII UIDs by creating a new one

[DerDreschner]

This pull request handles the case when a UID contains non-ASCII characters by handling the underlying UnicodeDecodeError. To avoid code duplication, I handle them the same way as when the original event contains no UID at all (AttributeError as None has no .encode() function).

Fixes #128

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.86%. Comparing base (97c73ba) to head (36699f3).
Report is 17 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #152      +/-   ##
==========================================
+ Coverage   91.79%   91.86%   +0.06%     
==========================================
  Files           4        4              
  Lines         378      381       +3     
  Branches      100       99       -1     
==========================================
+ Hits          347      350       +3     
  Misses         13       13              
  Partials       18       18              

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