Support lists in filter file with * or null

[tsalo]

Closes none.

Changes proposed in this pull request

• What it says on the tin.

[codecov-commenter]

Codecov Report

Attention: 9 lines in your changes are missing coverage. Please review.

Comparison is base (b55fedc) 79.62% compared to head (9581a69) 79.53%.

Files	Patch %	Lines
aslprep/cli/parser.py	62.50%	5 Missing and 4 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #388      +/-   ##
==========================================
- Coverage   79.62%   79.53%   -0.09%     
==========================================
  Files          37       37              
  Lines        3946     3968      +22     
  Branches      551      558       +7     
==========================================
+ Hits         3142     3156      +14     
- Misses        625      630       +5     
- Partials      179      182       +3     

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