fix: safely access "label" key

[Fijxu]

Fixes #5095

On some videos, label is missing from the video information. Invidious assumed that the label key existed.

Videos with label have this inside metadataBadgeRenderer:

{"style" => "BADGE_STYLE_TYPE_SIMPLE",
 "label" => "4K",
 "trackingParams" => "COMDENwwGAoiEwiCrebe6JWNAxWIxz8EHSQRFTU="}

but other videos, for some reason, look like this:

{"icon" => {"iconType" => "PERSON_RADAR"},
 "style" => "BADGE_STYLE_TYPE_SIMPLE",
 "trackingParams" => "CM4DENwwGAsiEwiCrebe6JWNAxWIxz8EHSQRFTU="}

As said in #5095 (comment), the labels seems to be stored somewhere else, so this fix is more like a lazy fix, but I'll leave it here just in case. Read #5282 (comment)

[Fijxu]

This works fine. Invidious ignores the item that doesn't contain label on it in the badges array.

Badges contain:

[{"metadataBadgeRenderer" =>
   {"icon" => {"iconType" => "PERSON_RADAR"},
    "style" => "BADGE_STYLE_TYPE_SIMPLE",
    "trackingParams" => "CGYQ3DAYFCITCMnfkM2Bl40DFe1duAQdSogeMg=="}},
 {"metadataBadgeRenderer" =>
   {"style" => "BADGE_STYLE_TYPE_SIMPLE",
    "label" => "4K",
    "trackingParams" => "CGYQ3DAYFCITCMnfkM2Bl40DFe1duAQdSogeMg=="}}]

The PERSON_RADAR icon means that the video has multiple tracks, so we could add the ability to see if a video has multiple tracks on the Features filter when searching a video on Invidious

[unixfox]

Good as a fast fix. We can implement the finding a fallback label in another PR.

[Fijxu]

fallback label in another PR.

Sorry, I forgot to say that Invidious doesn't ignores the label of the video, it just skips the following badge since is not the thing we are searching for on that part of the code:

[{"metadataBadgeRenderer" =>
   {"icon" => {"iconType" => "PERSON_RADAR"},
    "style" => "BADGE_STYLE_TYPE_SIMPLE",
    "trackingParams" => "CGYQ3DAYFCITCMnfkM2Bl40DFe1duAQdSogeMg=="}},

Then it checks the next one which is the one containing the label:

 {"metadataBadgeRenderer" =>
   {"style" => "BADGE_STYLE_TYPE_SIMPLE",
    "label" => "4K",
    "trackingParams" => "CGYQ3DAYFCITCMnfkM2Bl40DFe1duAQdSogeMg=="}}]

[syeopite]

Yeah good enough as a quick fix. This problem has been in Invidious for long enough...