If there is no duration metadata, take the first frame rather than throwing a KeyError.
Checkpoints
[x] If relevant, manual tests have been done to ensure the stability of the whole application and that the involved feature works
[ ] Automated tests covering the feature or the fix, have been written, deemed irrelevant (give the reason), or an issue has been created to implement the test (give the link)
[x] The PR or the original issue contains a short summary of the implemented solution.
PR Goal
Prevent exception when generating a preview on a video with missing duration metadata. duration metadata is typically missing on webm files recorded using the MediaStream Recording API. There is even a JS package to add duration to webm files.
Implemented solution
If there is no duration metadata, take the first frame rather than throwing a
KeyError.Checkpoints