bug fix

setup.py

@@ -88,7 +88,7 @@ setup(
         odsh_harvest=ckanext.odsh.plugin_odsh_harvest:OdshHarvestPlugin
         odsh_dcat_harvest=ckanext.odsh.plugin_odsh_dcat_harvest:OdshDCATHarvestPlugin
         tpsh_collections=ckanext.odsh.collection.plugin:CollectionsPlugin
-
+        thumbnail=ckanext.odsh.pdf_to_thumbnail.plugin:ThumbnailPlugin
         [paste.paster_command]
         odsh_initialization = ckanext.odsh.commands.initialization:Initialization