Fixes text_tracks breaking video edit view

[oscarssanchez]

Description of the Change

Fixes #273

It seems text_tracks are not being returned if a video does not contain them. The video-edit template uses text_tracks. This PR gets it defined if it is not already returned by the API response.

Closes #

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Checklist:

• I have read the CONTRIBUTING document.
• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have added tests to cover my change.
• All new and existing tests passed.

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Props @

[enrico-sorcinelli]

Thanks @oscarssanchez,
perhaps you should fix includes/admin/api/class-bc-admin-media-api.php too in order to avoid Invalid argument supplied for foreach() warning on line 1077.
Best regards