fix: crash when videoId is unitialized

app/src/main/java/com/github/libretube/services/AbstractPlayerService.kt

@@ -307,6 +307,8 @@ abstract class AbstractPlayerService : MediaLibraryService(), MediaLibrarySessio
         super.onDestroy()
     }
 
+    fun isVideoIdInitialized() = this::videoId.isInitialized
+
     /**
      * Stop the service when app is removed from the task manager.
      */

app/src/main/java/com/github/libretube/services/OfflinePlayerService.kt

@@ -84,6 +84,8 @@ open class OfflinePlayerService : AbstractPlayerService() {
      * Attempt to start an audio player with the given download items
      */
     override suspend fun startPlayback() {
+        if (!isVideoIdInitialized()) return
+
         val downloadWithItems = withContext(Dispatchers.IO) {
             Database.downloadDao().findById(videoId)
         }!!