bump gomuks, use new pause/resume commands

gomuks

@@ -1 +1 @@
-Subproject commit 53cae0e0334aef5ac376ea84f19ba1cff8a92310
+Subproject commit 081d5df14be6bf7131e955461207e26da7ad23c9

lib/controllers/client.dart

@@ -200,6 +200,9 @@ class ClientController extends AsyncNotifier<int> {
   Future<String?> setState(SetStateRequest request) async =>
       await _sendCommand("set_state", request.toJson());
 
+  Future<void> pauseSync() => _sendCommand("pause_sync");
+  Future<void> resumeSync() => _sendCommand("resume_sync");
+
   Future<void> verify(String recoveryKey) =>
       _sendCommand("verify", {"recovery_key": recoveryKey});
 

lib/controllers/gomuks_listener.dart

@@ -156,11 +156,12 @@ class GomuksListenerController extends AsyncNotifier<void> {
       // Mobile OSes block network access for backgrounded apps, so pause
       // syncing instead of letting it fail.
       ref.listen(AppPausedController.provider, (_, paused) {
+        final client = ref.read(ClientController.provider.notifier);
         if (paused) {
-          GomuksPauseSync(handle);
+          client.pauseSync().onError(showError);
         } else {
           ref.invalidate(TypingController.provider);
-          GomuksResumeSync(handle);
+          client.resumeSync().onError(showError);
         }
       }, fireImmediately: true);
     }

lib/helpers/extensions/gomuks_buffer.dart

@@ -15,7 +15,10 @@ extension GomuksOwnedBufferToX on GomuksOwnedBuffer {
     }
   }
 
-  dynamic toJsonAndFree() => jsonDecode(utf8.decode(toBytesAndFree()));
+  dynamic toJsonAndFree() {
+    final bytes = toBytesAndFree();
+    return bytes.isEmpty ? null : jsonDecode(utf8.decode(bytes));
+  }
 }
 
 extension JsonToGomuksBuffer on Map<String, dynamic> {