Some stickers are webps

[RansomTime]

For whatever reason some stickers on Discord are webps

Discord prevents you uploading webps as stickers, maybe they used to not?

Example sticker:

https://media.discordapp.net/stickers/942145830431903754.webp?size=160&quality=lossless

When adding this sticker "an unexpected error occured".

Not sure if it's worth actually handling these, having a custom error, or just ignoring them because as previously mentioned Discord disallows a webp upload

[yorunoken]

Does this still happen? The code saves all stickers as .png and replacing .webp with .png results in repeatable bug.