added filename to FileNotFoundError messages

[dafrose]

added Path object file to error message, such that the error message also reports, which file was not found.

Acknowledgment

• I acknowledge that this contribution will be available under the Apache 2 license.

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Summary

Whenever an input that is of type File or Directory is not found, a FileNotFoundError is raised. Previously, this error message included only information about the field name. This change adds the filename to the error message so a user can easily identify which file was not found. This simplifies the debugging process.

Checklist

• All tests passing
• I have added tests to cover my changes
• I have updated documentation (if necessary)
• My code follows the code style of this project
  (we are using black: you can pip install pre-commit,
  run pre-commit install in the pydra directory
  and black will be run automatically with each commit)

[dafrose]

I added this, because for some subjects in my workflow, one of the necessary inputs is missing. Rather than checking all subjects myself, I would prefer that the pydra tells me, which files are missing.

This is a minor change, so shouldn't cause any trouble, should it? @djarecka

[codecov]

Codecov Report

Merging #504 (1c9304c) into master (1100d7c) will decrease coverage by 38.86%.
The diff coverage is n/a.

❗ Current head 1c9304c differs from pull request most recent head 19661f9. Consider uploading reports for the commit 19661f9 to get more accurate results

@@             Coverage Diff             @@
##           master     #504       +/-   ##
===========================================
- Coverage   78.60%   39.74%   -38.87%     
===========================================
  Files          20       20               
  Lines        4301     4305        +4     
  Branches     1217     1182       -35     
===========================================
- Hits         3381     1711     -1670     
- Misses        725     2260     +1535     
- Partials      195      334      +139     

Flag	Coverage Δ
unittests	39.74% <ø> (-38.80%)	⬇️

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

Impacted Files	Coverage Δ
pydra/engine/specs.py	52.54% <ø> (-35.60%)	⬇️
pydra/tasks/__init__.py	0.00% <0.00%> (-100.00%)	⬇️
pydra/mark/functions.py	13.33% <0.00%> (-86.67%)	⬇️
pydra/engine/boutiques.py	0.00% <0.00%> (-84.47%)	⬇️
pydra/engine/state.py	28.53% <0.00%> (-62.78%)	⬇️
pydra/engine/graph.py	38.53% <0.00%> (-54.16%)	⬇️
pydra/engine/helpers_state.py	36.97% <0.00%> (-53.03%)	⬇️
pydra/engine/audit.py	37.03% <0.00%> (-51.86%)	⬇️
pydra/utils/messenger.py	45.71% <0.00%> (-48.58%)	⬇️
pydra/utils/profiler.py	0.00% <0.00%> (-43.52%)	⬇️
... and 9 more

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[dafrose]

I have had a brief look at the failed tests and apparently some tests expect the exact string that existed before as output... I guess I'll also adapt the tests. Next time, I'll make sure to run the tests offline first. Sorry about that.

[djarecka]

i'm sorry, I didn't realized that this was done. Thank you so much for this PR!