Allow URL video parsing when a warning is triggered by youtube-dl
Currently, when a video URL is given on a channel with the parse-url
flag enabled, youtube-dl is called to resolve video URLS for video
If any output reaches stderr, exec throws an error, intercepted
by the catch block, and nothing happens.
Thanks to @xcombelle to have suggested the use of --no-warning flag.
Test Plan: url:getvideotitle https://www.youtube.com/watch?v=4CXOb0Oubxo
Reviewed By: xcombelle
Maniphest Tasks: T1234
Differential Revision: https://devcentral.nasqueron.org/D1017