Older videos with `cinemr_guid` field are no longer playable
# Examples
- https://www.minds.com/newsfeed/629666316252356614 (not playable)
Sentry Issue: [ENGINE-S8](https://sentry.io/organizations/minds-inc/issues/1383673424/?referrer=gitlab_integration)
```
TypeError: Return value of Minds\Core\Media\Video\Transcoder\TranscodeStorage\S3Storage::ls() must be of the type array, null returned
File "/Core/Media/Video/Transcoder/TranscodeStorage/S3Storage.php", line 104, in Minds\Core\Media\Video\Transcoder\TranscodeStorage\S3Storage::ls
return array_column($s3Contents, 'Key');
File "/Core/Media/Video/Transcoder/Manager.php", line 83, in Minds\Core\Media\Video\Transcoder\Manager::getLegacyPolyfill
$files = $this->transcodeStorage->ls($opts['guid']);
File "/Core/Media/Video/Transcoder/Manager.php", line 70, in Minds\Core\Media\Video\Transcoder\Manager::getList
$response = $this->getLegacyPolyfill($opts);
File "/Core/Media/Video/Manager.php", line 73, in Minds\Core\Media\Video\Manager::getSources
'guid' => $video->getGuid(),
File "/Controllers/api/v2/media/video.php", line 29, in Minds\Controllers\api\v2\media\video::get
$sources = $videoManager->getSources($video);
...
(4 additional frame(s) were not displayed)
```
issue