takes id directly from package object

ckanext/odsh/pdf_to_thumbnail/thumbnail.py

@@ -140,7 +140,7 @@ def create_thumbnail_if_none_in_package(context, resources):
 
 
 def _get_package_dict_from_context(context):
-    package_id = context.get('package').as_dict().get('id')
+    package_id = context.get('package').id
     package_dict = toolkit.get_action('package_show')(None, {'id': package_id})
     return package_dict