Fix login bug for users with no school class

client/src/graphql/gql/meQuery.gql

@@ -1,4 +1,3 @@
-#import "./fragments/schoolClassParts.gql"
 #import "./fragments/userParts.gql"
 query MeQuery {
   me {

server/users/schema.py

@@ -89,7 +89,7 @@ class UserNode(DjangoObjectType):
 
     def resolve_school_classes(self, info):
         if self.selected_class() is None:  # then we don't have any class to return
-            return []
+            return SchoolClass.objects.none()
         return SchoolClass.objects.filter(
             Q(schoolclassmember__active=True, schoolclassmember__user=self) | Q(pk=self.selected_class().pk)).distinct()