Remove useless blank lines and spaces in api app

apps/api/serializers.py

@@ -6,6 +6,7 @@ from django.contrib.contenttypes.models import ContentType
 from django.contrib.auth.models import User
 from rest_framework.serializers import ModelSerializer
 
+
 class UserSerializer(ModelSerializer):
     """
     REST API Serializer for Users.

apps/api/viewsets.py

@@ -6,11 +6,8 @@ from django_filters.rest_framework import DjangoFilterBackend
 from django.db.models import Q
 from django.conf import settings
 from django.contrib.auth.models import User
-
 from rest_framework.viewsets import ReadOnlyModelViewSet, ModelViewSet
-
 from permission.backends import PermissionBackend
-
 from note_kfet.middlewares import get_current_session
 from note.models import Alias
 
@@ -47,7 +44,6 @@ class ReadOnlyProtectedModelViewSet(ReadOnlyModelViewSet):
         return self.model.objects.filter(PermissionBackend.filter_queryset(user, self.model, "view")).distinct()
 
 
-
 class UserViewSet(ReadProtectedModelViewSet):
     """
     REST API View set.