Write NaN to other H-factor table if calculation fails

[timothy-nunn]

Fixes one of the errors in #3957. This error occurs when calculating comparison H-factors for a table in the OUT.DAT. It does not matter if these values are not in the OUT.DAT and so this PR sets it as a NaN if the calculation fails.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 0% with 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 46.24%. Comparing base (88cc783) to head (61643fb).
⚠️ Report is 125 commits behind head on main.

Files with missing lines	Patch %	Lines
process/physics.py	0.00%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3965      +/-   ##
==========================================
- Coverage   46.24%   46.24%   -0.01%     
==========================================
  Files         123      123              
  Lines       28550    28553       +3     
==========================================
  Hits        13203    13203              
- Misses      15347    15350       +3     

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