Correctly handle corrupted SMT models

[ddaspit]

This change is 

[codecov-commenter]

Codecov Report

Attention: 3 lines in your changes are missing coverage. Please review.

Comparison is base (63738c2) 86.74% compared to head (3b850ff) 86.76%.

Files	Patch %	Lines
machine/translation/thot/thot_smt_model.py	75.00%	1 Missing ⚠️
machine/translation/thot/thot_utils.py	75.00%	1 Missing ⚠️
...hine/translation/thot/thot_word_alignment_model.py	75.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #68      +/-   ##
==========================================
+ Coverage   86.74%   86.76%   +0.01%     
==========================================
  Files         225      225              
  Lines       13526    13558      +32     
==========================================
+ Hits        11733    11763      +30     
- Misses       1793     1795       +2     

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[johnml1135]

Reviewed 9 of 9 files at r1, all commit messages.
Reviewable status: complete! all files reviewed, all discussions resolved (waiting on @ddaspit)