remove unnecessary logging and comments

[clmould]

Description

Closes #3982

Checklist

I confirm that I have completed the following checks:

• My changes follow the PROCESS style guide
• I have justified any large differences in the regression tests caused by this pull request in the comments.
• I have added new tests where appropriate for the changes I have made.
• If I have had to change any existing unit or integration tests, I have justified this change in the pull request comments.
• If I have made documentation changes, I have checked they render correctly.
• I have added documentation for my change, if appropriate.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 0% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 46.04%. Comparing base (f59059d) to head (9ff05d0).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
process/io/mfile.py	0.00%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3988      +/-   ##
==========================================
+ Coverage   46.03%   46.04%   +0.01%     
==========================================
  Files         123      123              
  Lines       28970    28961       -9     
==========================================
  Hits        13335    13335              
+ Misses      15635    15626       -9     

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[timothy-nunn]

Just another bit of code that can be eliminated since you've already removed some of it.

[timothy-nunn]

Suggested change

	except KeyError:
	raise # or substitute with any other exception type you want
	raise

This is just catching the KeyError and then immediately raising it again... Im guessing at some point there was some logging here