Add an exception for the bad char case

[adamtheturtle]

Fixes #1068

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (master@5452858). Click here to learn what that means.
The diff coverage is 100%.

@@           Coverage Diff            @@
##             master   #1071   +/-   ##
========================================
  Coverage          ?    100%           
========================================
  Files             ?      13           
  Lines             ?     619           
  Branches          ?      12           
========================================
  Hits              ?     619           
  Misses            ?       0           
  Partials          ?       0

Impacted Files	Coverage Δ
src/vws/vws.py	100% <ø> (ø)
src/vws/exceptions.py	100% <100%> (ø)
src/vws/_result_codes.py	100% <100%> (ø)
tests/test_exceptions.py	100% <100%> (ø)

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