services: clean up the code

* closes inveniosoftware/invenio-app-rdm#2685

invenio_records_resources/services/records/service.py

@@ -380,7 +380,7 @@ def read(self, identity, id_, expand=False, action="read"):
         record = self.record_cls.pid.resolve(id_)
         try:
             self.require_permission(identity, action, record=record)
-        except PermissionDeniedError as e:
+        except PermissionDeniedError:
             raise RecordPermissionDeniedError(action_name=action, record=record)
         # Run components
         for component in self.components: