Replace missing non-nullable Card attributes with empty strings

lib/pleroma/web/mastodon_api/views/status_view.ex

@@ -290,8 +290,8 @@ defmodule Pleroma.Web.MastodonAPI.StatusView do
       provider_url: page_url_data.scheme <> "://" <> page_url_data.host,
       url: page_url,
       image: image_url |> MediaProxy.url(),
-      title: rich_media[:title],
-      description: rich_media[:description],
+      title: rich_media[:title] || "",
+      description: rich_media[:description] || "",
       pleroma: %{
         opengraph: rich_media
       }

lib/pleroma/web/rich_media/parser.ex

@@ -37,7 +37,10 @@ defmodule Pleroma.Web.RichMedia.Parser do
     try do
       {:ok, %Tesla.Env{body: html}} = Pleroma.HTTP.get(url, [], adapter: @hackney_options)
 
-      html |> maybe_parse() |> clean_parsed_data() |> check_parsed_data()
+      html
+      |> maybe_parse()
+      |> clean_parsed_data()
+      |> check_parsed_data()
     rescue
       e ->
         {:error, "Parsing error: #{inspect(e)}"}