Fix orphan range queries with null parents

[Ishubhammohole]

Summary

• Return immediately from orphan Item and Transition parent-range queries instead of calling through a null parent.
• Make composition ancestry traversal reject an orphan child without dereferencing a null composition, including when no error-status pointer is supplied.
• Add a C++ regression covering clip, transition, and composition orphan-range paths with and without ErrorStatus.

The regression failed against the original implementation before the production fix.

Testing

• cmake --build /tmp/otio-2044-build -j4 — passed
• ctest --test-dir /tmp/otio-2044-build --output-on-failure -E "^test_bundle$" — 9/9 passed
• ctest --test-dir /tmp/otio-2044-build --output-on-failure -R "^test_bundle$" --timeout 300 — 1/1 passed
• python -m unittest tests.test_composition tests.test_transition — 50 passed
• make test — 481 passed, 2 skipped
• make lint — passed
• make manifest — passed
• clang-format --dry-run --Werror ... — not run; clang-format is not installed in this environment

Fixes #2044

[linux-foundation-easycla]

• ❌ - login: @Ishubhammohole / name: Shubham Mohole. The commit (38c065c, 7c92d36) is not authorized under a signed CLA. Please click here to be authorized. For further assistance with EasyCLA, please visit our EasyCLA portal and chat with our support bot.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 83.52%. Comparing base (a639246) to head (38c065c).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2049      +/-   ##
==========================================
+ Coverage   83.48%   83.52%   +0.04%     
==========================================
  Files         182      182              
  Lines       13517    13538      +21     
  Branches     1254     1259       +5     
==========================================
+ Hits        11284    11307      +23     
+ Misses       2060     2058       -2     
  Partials      173      173              

Flag	Coverage Δ
py-unittests	83.52% <100.00%> (+0.04%)	⬆️

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

Files with missing lines	Coverage Δ
src/opentimelineio/composition.cpp	79.67% <100.00%> (+0.40%)	⬆️
src/opentimelineio/item.cpp	94.44% <100.00%> (+2.58%)	⬆️
src/opentimelineio/transition.cpp	100.00% <100.00%> (ø)
tests/test_composition.py	99.71% <100.00%> (+<0.01%)	⬆️

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[jminor]

Hi @Ishubhammohole - thanks, this PR is looking pretty good. We'll arrange for an OTIO committer to review it once the CLA requirement is met. Let us know if you have questions about that step.

Out of curiosity, how did you come across this issue, and what lead you to contribute to OTIO?

[Ishubhammohole]

Hi @Ishubhammohole - thanks, this PR is looking pretty good. We'll arrange for an OTIO committer to review it once the CLA requirement is met. Let us know if you have questions about that step.

Out of curiosity, how did you come across this issue, and what lead you to contribute to OTIO?

Thanks! I came across #2044 while looking through OTIO’s open issues for C++ bugs where I could make a meaningful contribution. This one caught my attention because it involved a clear null-parent crash and had a reproducible edge case.

I decided to contribute to OTIO because I wanted to work on a mature C++ codebase and get more experience with real-world debugging, regression testing, and contributing to an established open-source project.

[jminor]

@Ishubhammohole thanks - and how did you find OTIO?