The extension has conflict with ckanext-scheming when no extras is available

[MandanaMoshref]

I am using ckanext-scheming and ckanext-resourcedictionary. My schema includes both repeating_subfields and additional extra fields (normal text fields but additional to the standard ckan attributes). An error occurs when I want to add a resource dictionary for my dataset (see below). My understanding is that after updating/saving the resource dictionary, the action_type view will be called and this triggers the validator in scheming. As I have no extra in data_dict but a repeating_subfields, it tries to check for extras that do not exist, and thrwos an error.
Is there anyway that I can overcome this issue?
Below the error log:

2023-08-28 14:06:29,374 ERROR [ckan.config.middleware.flask_app] 'extras'
Traceback (most recent call last):
  File "/usr/lib/ckan/default/lib/python3.8/site-packages/flask/app.py", line 1484, in full_dispatch_request
    rv = self.dispatch_request()
  File "/usr/lib/ckan/default/lib/python3.8/site-packages/flask/app.py", line 1469, in dispatch_request
    return self.ensure_sync(self.view_functions[rule.endpoint])(**view_args)
  File "/usr/lib/ckan/default/lib/python3.8/site-packages/flask/views.py", line 109, in view
    return current_app.ensure_sync(self.dispatch_request)(**kwargs)
  File "/usr/lib/ckan/default/lib/python3.8/site-packages/flask/views.py", line 190, in dispatch_request
    return current_app.ensure_sync(meth)(**kwargs)
  File "/usr/lib/ckan/default/src/ckanext-resourcedictionary/ckanext/resourcedictionary/views/resource_dictionary.py", line 98, in post
    get_action(u'resource_dictionary_create')(context, data_dict)
  File "/usr/lib/ckan/default/src/ckan/ckan/logic/__init__.py", line 548, in wrapped
    result = _action(context, data_dict, **kw)
  File "/usr/lib/ckan/default/src/ckanext-resourcedictionary/ckanext/resourcedictionary/logic/action/create.py", line 100, in resource_dictionary_create
    res = get_action(u'datastore_create')(
  File "/usr/lib/ckan/default/src/ckan/ckan/logic/__init__.py", line 548, in wrapped
    result = _action(context, data_dict, **kw)
  File "/usr/lib/ckan/default/src/ckan/ckanext/datastore/logic/action.py", line 172, in datastore_create
    set_datastore_active_flag(context, data_dict, True)
  File "/usr/lib/ckan/default/src/ckan/ckanext/datastore/logic/action.py", line 690, in set_datastore_active_flag
    psi.index_package(_data_dict)
  File "/usr/lib/ckan/default/src/ckan/ckan/lib/search/index.py", line 123, in index_package
    validated_pkg_dict, _errors = lib_plugins.plugin_validate(
  File "/usr/lib/ckan/default/src/ckan/ckan/lib/plugins.py", line 332, in plugin_validate
    result = plugin.validate(context, data_dict, schema, action)
  File "/usr/lib/ckan/default/src/ckanext-scheming/ckanext/scheming/plugins.py", line 283, in validate
    for ex in data_dict['extras']:
KeyError: 'extras'
```