Fix migrations

Author: Gaël UTARD

…re/migrations/0019_auto_20201112_1010.py …re/migrations/0020_auto_20201112_1010.pygeotrek/core/migrations/0019_auto_20201112_1010.py renamed to geotrek/core/migrations/0020_auto_20201112_1010.py geotrek/core/migrations/0019_auto_20201112_1010.py renamed to geotrek/core/migrations/0020_auto_20201112_1010.py

@@ -7,7 +7,7 @@
 class Migration(migrations.Migration):
 
     dependencies = [
-        ('core', '0018_remove_other_objects_from_factories'),
+        ('core', '0019_auto_20201117_1302'),
     ]
 
     operations = [

mapentity/registry.py

@@ -132,9 +132,9 @@ class dynamic_tile_view(mapentity_views.MapEntityTileLayer):
                 pass
             tile_view = dynamic_tile_view
 
-        if not tile_view.queryset:
+        if tile_view.queryset is None:
             tile_view.queryset = self.get_queryset()
-        if not tile_view.serializer_class:
+        if tile_view.serializer_class is None:
             tile_view.serializer_class = self.get_tile_serializer()
 
         picked.append(tile_view)