about --get-thumbnail

[ghost]

I usually work with youtube-dl output with a linux script for parsing data output. When youtube-dl don't find a thumbnail in the given link, wouldn't it be better to show "null" text or null line(\n)? I give an example to better understanding. If I run:

youtube-dl -g --get-title --get-id --get-format --get-thumbnail --get-filename --all-formats http://www.marca.com/2014/11/17/futbol/seleccion/1416230388.html

Output is:
WARNING: Falling back on generic information extractor.
¿Qué jugador alemán se parece a Raúl, según Casillas? - MARCA.com
video
http://k.uecdn.es/p/110/sp/0/playManifest/entryId/0_jui4h43j/format/url/flavorId/0_fu49nzrj/video.mp4
¿Qué jugador alemán se parece a Raúl, según Casillas - MARCA.com-video.mp4
0 - unknown

That output gives (in order): title, id, video link, filename and format, but not the thumbnail link that I requested. I think that would be better to have a predictable output of (in this case) 6 lines, because that way would better to manage output for post-processing tasks, something like:
title
id
video_link
(null) or NOT_FOUND or "\n"
filename
format

Thank you.

[phihag]

If you have that much output, I strongly recommend using the --dump-json option instead. It sounds like you are parsing it anyways, so that should also simplify the parsing itself.