permit corrupt MRC files

[garrettwrong]

lots of published datasets are full of junk metadata ...

This should allow us to still open them. We had fixed this in a few places, but I found one more trying to load a new dataset. Looking around I spotted an additional one as well.

[garrettwrong]

Noting this will emit a warning about the MRC file's metadata, but still allow us to read the data.

/scratch/gbwright/miniconda3/envs/smca/lib/python3.12/site-packages/mrcfile/mrcinterpreter.py:206: RuntimeWarning: Map ID string not found - not an MRC file, or file is corrupt
  warnings.warn(msg, RuntimeWarning)
/scratch/gbwright/miniconda3/envs/smca/lib/python3.12/site-packages/mrcfile/mrcinterpreter.py:216: RuntimeWarning: Unrecognised machine stamp: 0x00 0x00 0x00 0x00
  warnings.warn(str(err), RuntimeWarning)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.60%. Comparing base (c255119) to head (834ec5d).

Additional details and impacted files

@@           Coverage Diff            @@
##           develop    #1292   +/-   ##
========================================
  Coverage    90.60%   90.60%           
========================================
  Files          132      132           
  Lines        14181    14181           
========================================
  Hits         12849    12849           
  Misses        1332     1332           

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