130 crash when supplying commit argument

[coordt]

Fixes missing current version in the context and bad error reporting

Fixes #130
Fixes #131

[github-actions]

Version hint: patch
Current version: 0.17.0
New version (when merged): 0.17.1

_{Comment ID: Display the version hint-auto-generated}

[codecov]

Codecov Report

Attention: 6 lines in your changes are missing coverage. Please review.

Comparison is base (c15b23b) 93.22% compared to head (10e5d7d) 92.83%.
Report is 2 commits behind head on master.

Files	Patch %	Lines
bumpversion/scm.py	14.28%	4 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #133      +/-   ##
==========================================
- Coverage   93.22%   92.83%   -0.40%     
==========================================
  Files          21       21              
  Lines        1403     1409       +6     
  Branches      292      294       +2     
==========================================
  Hits         1308     1308              
- Misses         66       70       +4     
- Partials       29       31       +2     

Flag	Coverage Δ
python-3.10	92.83% <33.33%> (-0.40%)	⬇️
python-3.11	92.83% <33.33%> (-0.40%)	⬇️
python-3.8	92.83% <33.33%> (-0.40%)	⬇️
python-3.9	92.83% <33.33%> (-0.40%)	⬇️

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