Subtitles warning with --all-subs while using -g

[Hackerpcs]

• I've verified and I assure that I'm running youtube-dl 2018.09.01

Before submitting an issue make sure you have:

• At least skimmed through the README, most notably the FAQ and BUGS sections
• Searched the bugtracker for similar issues including closed ones
• Checked that provided video/audio/playlist URLs (if any) are alive and playable in a browser

What is the purpose of your issue?

• Bug report (encountered problems with youtube-dl)

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youtube-dl -v -g https://www.youtube.com/watch\?v\=LdS6L-rqVzg
[debug] System config: []
[debug] User config: ['--embed-thumbnail', '--add-metadata', '--fixup', 'warn', '--convert-subs', 'srt', '--all-subs', '--embed-subs', '--write-info-json', '--merge-output-format', 'mkv']
[debug] Custom config: []
[debug] Command-line args: ['-v', '-g', 'https://www.youtube.com/watch?v=LdS6L-rqVzg']
[debug] Encodings: locale cp1253, fs mbcs, out cp737, pref cp1253
[debug] youtube-dl version 2018.09.01
[debug] Python version 3.4.4 (CPython) - Windows-7-6.1.7601-SP1
[debug] exe versions: ffmpeg N-91735-g93b35a0555, ffprobe N-91735-g93b35a0555, phantomjs 2.1.1
[debug] Proxy map: {}
WARNING: video doesn't have subtitles
[debug] Default format spec: bestvideo+bestaudio/best
https://example.googlevideo.com/videoplayback
https://example.googlevideo.com/videoplayback

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If --all-subs option is on (either from config file or command line) while using -g option, the message "WARNING: video doesn't have subtitles" is shown if the video has no subtitles.