Add badge for tracks whose albums cannot be imported

Includes a small optimization that removes "" release IDs from the list
of IDs checked against releases in the database.

lib/music_library_web/live/stats_live/index.ex

@@ -20,10 +20,7 @@ defmodule MusicLibraryWeb.StatsLive.Index do
 
     recent_tracks = LastFm.Feed.all()
 
-    release_ids =
-      recent_tracks
-      |> Enum.map(fn t -> t.album.musicbrainz_id end)
-      |> Enum.uniq()
+    release_ids = release_ids(recent_tracks)
 
     collected_release_ids = Collection.collected_release_ids(release_ids)
     wishlisted_release_ids = Wishlist.wishlisted_release_ids(release_ids)
@@ -83,10 +80,7 @@ defmodule MusicLibraryWeb.StatsLive.Index do
   end
 
   def handle_info(%{tracks: recent_tracks}, socket) do
-    release_ids =
-      recent_tracks
-      |> Enum.map(fn t -> t.album.musicbrainz_id end)
-      |> Enum.uniq()
+    release_ids = release_ids(recent_tracks)
 
     collected_release_ids = Collection.collected_release_ids(release_ids)
     wishlisted_release_ids = Wishlist.wishlisted_release_ids(release_ids)
@@ -100,6 +94,13 @@ defmodule MusicLibraryWeb.StatsLive.Index do
      |> stream(:recent_tracks, recent_tracks, reset: true)}
   end
 
+  defp release_ids(recent_tracks) do
+    recent_tracks
+    |> Enum.map(fn t -> t.album.musicbrainz_id end)
+    |> Enum.uniq()
+    |> Enum.reject(fn musicbrainz_id -> musicbrainz_id == "" end)
+  end
+
   # The Tailwind build step requires all needed classes to be explicitly referenced
   # in the source code, and not dynamically generated. This implies that one cannot
   # (for example) interpolate a number in a class name.

lib/music_library_web/live/stats_live/index.html.heex

@@ -114,6 +114,19 @@
             </div>
           </div>
 
+          <span
+            :if={track.album.musicbrainz_id == ""}
+            class={[
+              "inline-flex items-center rounded-md",
+              "px-2 py-1 text-xs font-medium",
+              "ring-1 ring-inset",
+              "bg-zinc-50 dark:bg-zinc-500/10",
+              "text-zinc-700 dark:text-zinc-400",
+              "ring-zinc-600/20 dark:ring-zinc-500/20"
+            ]}
+          >
+            <%= gettext("No MusicBrainz ID") %>
+          </span>
           <span
             :if={track.album.musicbrainz_id in @collected_release_ids}
             class={[
@@ -143,7 +156,8 @@
 
           <div
             :if={
-              track.album.musicbrainz_id not in @collected_release_ids and
+              track.album.musicbrainz_id !== "" and
+                track.album.musicbrainz_id not in @collected_release_ids and
                 track.album.musicbrainz_id not in @wishlisted_release_ids
             }
             class="relative flex-none"