Schema update for reference field

ckanext/odsh/plugin.py

@@ -96,6 +96,13 @@ class OdshPlugin(plugins.SingletonPlugin, DefaultTranslation, DefaultDatasetForm
         for field in ['title', 'license_id']:
             schema.update({field: [toolkit.get_converter('not_empty')]})
         
+        schema.update({
+            'reference': [
+                toolkit.get_validator('ignore_missing'),
+                toolkit.get_converter('convert_to_extras')
+            ]
+        })
+        
         for i, item in enumerate(schema['tags']['name']):
             if item == toolkit.get_validator('tag_name_validator'):
                 schema['tags']['name'][i] = toolkit.get_validator(