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Invalid avatar URL sent when executing webhook with no avatar

Created by: spiralw

Details

DiscordWebhook.AvatarUrl doesn't check for an avatar hash before returning an URL. This ends up returning an invalid avatar URL (for example https://cdn.discordapp.com/avatars/776336244674002984/.png?size=1024).

Steps to reproduce

  • Create a webhook, and do not add an avatar.
  • Send a webhook message, and do not provide an avatar URL. (Relevant DSharpPlus code which uses the webhook's own avatar URL is at the end of this line)
  • The message will be sent with an invalid avatar URL (which creates link unfurling issues on Discord's side).