Fix: Cannot read properties of undefined (reading 'width') in Video GT job

[klakhov]

Motivation and context

It seems that a regression was introduced during recent refactoring related to frame metadata. In a GT job created from a video, navigating through frames results in an error: *Cannot read properties of undefined (reading 'width').

How has this been tested?

Checklist

• I submit my changes into the develop branch
• I have created a changelog fragment
• I have updated the documentation accordingly
• I have added tests to cover my changes
• I have linked related issues (see GitHub docs)

License

• I submit my code changes under the same MIT License that covers the project.
  Feel free to contact the maintainers if that's a concern.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 73.94%. Comparing base (df5678a) to head (6482bc5).
Report is 1 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #9095      +/-   ##
===========================================
+ Coverage    73.91%   73.94%   +0.02%     
===========================================
  Files          428      428              
  Lines        44530    44532       +2     
  Branches      3881     3881              
===========================================
+ Hits         32916    32930      +14     
+ Misses       11614    11602      -12     

Components	Coverage Δ
cvat-ui	77.50% <100.00%> (+0.06%)	⬆️
cvat-server	71.00% <ø> (ø)

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud