Fix None object appearing in config with anat-only QSIPrep inputs.

[smeisler]

Closes none but issue brought up in https://neurostars.org/t/qsirecon-dsi-studio-autotrack/31657

Changes proposed in this pull request

When iterating through input DWIs and anatomicals, do not input a None for lack of anatomicals.

[tsalo]

I don't think the Config object will handle the updated format. I'd recommend modifying config.py's handling of processing_list to allow None objects instead.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 36.36364% with 7 lines in your changes missing coverage. Please review.

Project coverage is 48.74%. Comparing base (4f7dbde) to head (ee22e2d).

Files with missing lines	Patch %	Lines
qsirecon/cli/parser.py	36.36%	7 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #208      +/-   ##
==========================================
- Coverage   48.75%   48.74%   -0.01%     
==========================================
  Files          56       56              
  Lines        7423     7424       +1     
  Branches     1015     1015              
==========================================
  Hits         3619     3619              
- Misses       3586     3587       +1     
  Partials      218      218              

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[tsalo]

We should probably have a test that ignores the anatomical data.