ref |> 播控中心处理contentId为空情况

Signed-off-by: xugenyuan <xugenyuan@wondertek.com.cn>

@@ -69,14 +69,14 @@ export class BackgroundAudioController {
 
   //设置播放元数据
   async setSessionMetaData(assetId: string, title: string, mediaImage: Resource, artist: string) {
-    this.lastItemAssetId = assetId
-    this.lastItemTitle = title
+    this.lastItemAssetId = assetId.length > 0 ? assetId : ""
+    this.lastItemTitle = title || ""
     this.lastItemMediaImage = mediaImage
-    this.lastItemArtist = artist
+    this.lastItemArtist = artist || ""
   }
 
   async setSessionMetaDataWithDuration(assetId: string, title: string, mediaImage: Resource, artist: string, duration: number) {
-    Logger.debug(TAG, `SetAVMetadata assetId: ${assetId}}, title: ${title}, mediaImage: ${mediaImage}, artist: ${artist}, duration: ${duration}`);
+    Logger.debug(TAG, `SetAVMetadata assetId: ${assetId}, title: ${title}, mediaImage: ${mediaImage}, artist: ${artist}, duration: ${duration}`);
 
     if (!this.gotContextFunc) { return }
     let pixelMapImage:image.PixelMap | null = null
@@ -168,7 +168,7 @@ export class BackgroundAudioController {
     // Logger.debug(TAG, `set progress: ` + progressDuration + " duration: " + totalDuration);
     this.lastProgress = newProgress
 
-    if (this.lastItemAssetId) {
+    if (this.lastItemAssetId != undefined) {
       this.lastItemTotalDuration = totalDuration
       await this.setSessionMetaDataWithDuration(
         this.lastItemAssetId ?? "",