fix: avoid recursion limit when concatenating EmptyArrays

[ikrommyd]

Fixes #3663

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 82.66%. Comparing base (b749e49) to head (cdb105b).
⚠️ Report is 432 commits behind head on main.

Additional details and impacted files

Files with missing lines	Coverage Δ
src/awkward/contents/emptyarray.py	76.47% <100.00%> (+0.84%)	⬆️

... and 196 files with indirect coverage changes

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[github-actions]

The documentation preview is ready to be viewed at http://preview.awkward-array.org.s3-website.us-east-1.amazonaws.com/PR3664

[ianna]

@ikrommyd - thanks for looking into it! I wonder if it's better to do a lazy iteration instead of a list comprehension. Thanks.

[ikrommyd]

@ikrommyd - thanks for looking into it! I wonder if it's better to do a lazy iteration instead of a list comprehension. Thanks.

What lazy iteration did you think about? others is already a list in memory and I'm just trying to drop the empty array elements. What do you have in mind?