fix crash when converting messages with a trailing underscore (#175)

[aler9]

Fixes #175

[codecov[bot]]

Codecov Report

Merging #176 (381a388) into main (5f345c6) will decrease coverage by 0.11%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #176      +/-   ##
==========================================
- Coverage   80.80%   80.69%   -0.11%     
==========================================
  Files          53       53              
  Lines        5829     5829              
==========================================
- Hits         4710     4704       -6     
- Misses        875      880       +5     
- Partials      244      245       +1     

Files Changed	Coverage Δ
pkg/conversion/message_definition.go	100.00% <100.00%> (ø)

... and 2 files with indirect coverage changes

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