feat(ui): display default audio name and artist name

Author: SevenOutman

src/components/list.tsx

@@ -41,8 +41,12 @@ export function Playlist({
               }}
             ></span>
             <span className="aplayer-list-index">{index + 1}</span>
-            <span className="aplayer-list-title">{audioInfo.name}</span>
-            <span className="aplayer-list-author">{audioInfo.artist}</span>
+            <span className="aplayer-list-title">
+              {audioInfo.name ?? "Audio name"}
+            </span>
+            <span className="aplayer-list-author">
+              {audioInfo.artist ?? "Audio artist"}
+            </span>
           </li>
         ))}
       </ol>

src/components/player.tsx

@@ -105,8 +105,13 @@ export function APlayer({
           </div>
           <div className="aplayer-info">
             <div className="aplayer-music">
-              <span className="aplayer-title">{playingAudio?.name}</span>
-              <span className="aplayer-author"> - {playingAudio?.artist}</span>
+              <span className="aplayer-title">
+                {playingAudio?.name ?? "Audio name"}
+              </span>
+              <span className="aplayer-author">
+                {" "}
+                - {playingAudio?.artist ?? "Audio artist"}
+              </span>
             </div>
             <div className="aplayer-lrc"></div>
             <PlaybackControls