trivial: add forgotten pylint mark for cron jobs

wcs/qommon/publisher.py

@@ -553,6 +553,7 @@ class QommonPublisher(Publisher):
     def register_cronjob(cls, cronjob):
         if not cls.cronjobs:
             cls.cronjobs = []
+        # noqa pylint: disable=not-an-iterable
         if cronjob.name and any(x for x in cls.cronjobs if x.name == cronjob.name):
             # already registered
             return