Catch encoding errors when creating link previews. (#30853)

app/services/fetch_link_card_service.rb

@@ -32,7 +32,7 @@ class FetchLinkCardService < BaseService
     end
 
     attach_card if @card&.persisted?
-  rescue HTTP::Error, OpenSSL::SSL::SSLError, Addressable::URI::InvalidURIError, Mastodon::HostValidationError, Mastodon::LengthValidationError => e
+  rescue HTTP::Error, OpenSSL::SSL::SSLError, Addressable::URI::InvalidURIError, Mastodon::HostValidationError, Mastodon::LengthValidationError, Encoding::UndefinedConversionError => e
     Rails.logger.debug { "Error fetching link #{@original_url}: #{e}" }
     nil
   end