Omit false output templates

[tclose]

Types of changes

• Bug fix (non-breaking change which fixes an issue)

Summary

Optional output fields with output_file_template metadata (i.e. of type=ty.Union[Path, bool]) were getting printed to the command line regardless of whether a value for the field was set to False.

Checklist

• I have added tests to cover my changes (if necessary)

[codecov]

Codecov Report

Patch coverage: 100.00% and project coverage change: -0.50% ⚠️

Comparison is base (91c5a15) 83.23% compared to head (4d10b57) 82.73%.

❗ Current head 4d10b57 differs from pull request most recent head 62e3944. Consider uploading reports for the commit 62e3944 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #693      +/-   ##
==========================================
- Coverage   83.23%   82.73%   -0.50%     
==========================================
  Files          22       22              
  Lines        4848     4849       +1     
  Branches     1392        0    -1392     
==========================================
- Hits         4035     4012      -23     
- Misses        809      837      +28     
+ Partials        4        0       -4     

Flag	Coverage Δ
unittests	82.73% <100.00%> (-0.50%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files Changed	Coverage Δ
pydra/engine/helpers_file.py	91.80% <ø> (-0.55%)	⬇️
pydra/engine/helpers.py	86.35% <100.00%> (-0.25%)	⬇️

... and 4 files with indirect coverage changes

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[effigies]

Test looks good. Q about logic.