Fixed serialization error

api/funkwhale_api/federation/serializers.py

@@ -239,7 +239,7 @@ class APILibraryCreateSerializer(serializers.ModelSerializer):
         return validated_data
 
     def create(self, validated_data):
-        library = models.Library.objects.get_or_create(
+        library = models.Library.objects.update_or_create(
             url=validated_data['library']['id'],
             defaults={
                 'actor': validated_data['actor'],

api/funkwhale_api/federation/views.py

@@ -68,7 +68,7 @@ class InstanceActorViewSet(FederationMixin, viewsets.GenericViewSet):
             data = handler(request.data, actor=request.actor)
         except NotImplementedError:
             return response.Response(status=405)
-        return response.Response(data, status=200)
+        return response.Response({}, status=200)
 
     @detail_route(methods=['get', 'post'])
     def outbox(self, request, *args, **kwargs):
@@ -80,7 +80,7 @@ class InstanceActorViewSet(FederationMixin, viewsets.GenericViewSet):
             data = handler(request.data, actor=request.actor)
         except NotImplementedError:
             return response.Response(status=405)
-        return response.Response(data, status=200)
+        return response.Response({}, status=200)
 
 
 class WellKnownViewSet(FederationMixin, viewsets.GenericViewSet):