if a youtube video is no longer available on youtube, show a notice for the editor

[vkemeter]

in case a video is deleted on youtube we should at least give a hint to the editor on the website - better in the backend, that the desired youtube video is no longer available.

[josefglatz]

should this be part of supseven/supi? feels more like a patch for TYPO3 core

[vkemeter]

good question. i dont know. we might discuss it somehow.

[vkemeter]

any ideas @josefglatz ? wanna talk?