Merge pull request #192 from hayribakici/#191_404

Catching empty response on `PlaybackState`

lib/src/endpoints/player.dart

@@ -27,17 +27,22 @@ class PlayerEndpoint extends _MeEndpointBase {
   }
 
   /// Returns the current playback state, including progress, track
-  /// and active device.
+  /// and active device. Returns an empty [PlaybackState] object when
+  /// no playback context has been started.
   @Deprecated('Use [playbackState] instead')
   Future<PlaybackState> player([String? market]) async {
     return playbackState(Market.values.asNameMap()[market]);
   }
 
   /// Returns the current playback state, including progress, track
-  /// and active device.
+  /// and active device. Returns an empty [PlaybackState] object when
+  /// no playback context has been started.
   Future<PlaybackState> playbackState([Market? market]) async {
-    var jsonString =
-        await _api._get('$_path?${_buildQuery({'market': market?.name})}');
+    var jsonString = await _api._get('$_path?${_buildQuery({'market': market?.name})}');
+
+    if (jsonString.isEmpty) {
+      return PlaybackState();
+    }
     final map = json.decode(jsonString);
     return PlaybackState.fromJson(map);
   }