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API: Check if playlist has any videos on it.
Invidious assumes that every playlist will have at least one video because it needs to check for the `index` key. So if there is no videos on a playlist, there is no `index` key and Invidious throws `Index out of bounds`
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@ -74,7 +74,9 @@ module Invidious::Routes::API::V1::Misc
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response = playlist.to_json(offset, video_id: video_id)
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json_response = JSON.parse(response)
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if json_response["videos"].as_a[0]["index"] != offset
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if json_response["videos"].as_a.empty?
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json_response = JSON.parse(response)
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elsif json_response["videos"].as_a[0]["index"] != offset
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offset = json_response["videos"].as_a[0]["index"].as_i
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lookback = offset < 50 ? offset : 50
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response = playlist.to_json(offset - lookback)
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