Older videos with `cinemr_guid` field are no longer playable

Examples

• https://www.minds.com/newsfeed/629666316252356614 (not playable)

Sentry Issue: ENGINE-S8

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)