If artwork retrival fails, gracefully fallback to placeholder image

assets/js/player.js

@@ -52,6 +52,7 @@
   };
 
   var currentKey = null;
+  var currentTrack = null;
   var siteName = CFG.siteName || 'Radio';
 
   /* ---------------------------------------------------------------- utils */
@@ -362,6 +363,15 @@
     if (track) updateMediaSession(track, src);
   }
 
+  // A provider can return a URL that 404s (Last.fm in particular). Fall back
+  // to the placeholder once, instead of leaving a broken image on screen.
+  if (el.art) {
+    el.art.addEventListener('error', function () {
+      if (el.art.getAttribute('src') === CFG.fallbackArt) return;
+      setArt('', '', currentTrack);
+    });
+  }
+
   function resolveArtwork(track, providerArt) {
     var source = CFG.artworkSource || 'auto';
     if (source === 'none') { setArt('', '', track); return; }
@@ -474,6 +484,7 @@
 
   /* --------------------------------------------------------------- poll */
   function onNewTrack(t, providerArt) {
+    currentTrack = t;
     var joined = (t.artist && t.title) ? (t.artist + ' – ' + t.title) : (t.title || t.artist || '');
     if (el.name)   el.name.textContent   = t.title || siteName;
     if (el.artist) el.artist.textContent = t.artist || '';