Fix package export

[talmo]

Description

In #1559, we switched up the format to use zero-padded, constant length byte strings for embedded PNG encoded images for .pkg.slp files.

Right now this throws an error when we export from labels that have videos without any labeled frames, as is common when generating splits or when there are only predictions in a given video (but not user labels).

This PR fixes that by checking for zero length videos during export.

Types of changes

• Bugfix
• New feature
• Refactor / Code style update (no logical changes)
• Build / CI changes
• Documentation Update
• Other (explain)

Does this address any currently open issues?

[list open issues here]

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• Make sure you are making a pull request against the develop branch (not main). Also you should start your branch off develop
• Add tests that prove your fix is effective or that your feature works
• Add necessary documentation (if appropriate)

Thank you for contributing to SLEAP!

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Summary by CodeRabbit

• Bug Fixes
  • Improved handling of empty frames in video processing to ensure accurate frame size calculations.

[coderabbitai]

Walkthrough

The update in the codebase involves a modification to the way maximum frame size is calculated in a video processing context. This change specifically addresses the handling of empty frames to ensure the calculation is robust. There were no changes to function signatures or other global elements, indicating a targeted fix without altering the API or system-wide data structures.

Changes

File(s)	Summary
sleap/io/video.py	Modified the calculation of max_frame_size to better handle empty frames.

🐇🎉
To frames once empty, a fix we bestow,
In the code where the video streams flow.
No signature changed, no structure dismayed,
Just a rabbit's touch to the frames displayed. 🎬🌟

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Review Status

Actionable comments generated: 0

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Commits

Files that changed from the base of the PR and between cb82d36 and de5556f.

Files selected for processing (1)

• sleap/io/video.py (1 hunks)

Additional comments: 1

sleap/io/video.py (1)

• 1450-1457: The changes to calculate max_frame_size correctly handle the case of empty frames by checking for non-zero length before finding the maximum. This should prevent errors during the export process when dealing with videos that have no labeled frames.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (cb82d36) 73.37% compared to head (de5556f) 73.38%.

Additional details and impacted files

@@           Coverage Diff            @@
##           develop    #1619   +/-   ##
========================================
  Coverage    73.37%   73.38%           
========================================
  Files          134      134           
  Lines        24024    24024           
========================================
+ Hits         17628    17630    +2     
+ Misses        6396     6394    -2     

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