Fix data source type choices during bulk edit

netbox/core/forms/bulk_edit.py

@@ -15,10 +15,8 @@ __all__ = (
 class DataSourceBulkEditForm(NetBoxModelBulkEditForm):
     type = forms.ChoiceField(
         label=_('Type'),
-        # TODO: Field value should be empty on init (needs add_blank_choice())
         choices=get_data_backend_choices,
-        required=False,
-        initial=''
+        required=False
     )
     enabled = forms.NullBooleanField(
         required=False,

netbox/core/utils.py

@@ -8,7 +8,10 @@ __all__ = (
 
 def get_data_backend_choices():
     return [
-        (name, cls.label) for name, cls in registry['data_backends'].items()
+        (None, '---------'),
+        *[
+            (name, cls.label) for name, cls in registry['data_backends'].items()
+        ]
     ]